Data on frost resistance zones. Natural and climatic zones of Russia Climatic zones by numbers

USDA Hardiness Zones

The specified climatic zoning of territories is an artificial division of places where plants are grown, based on the ability of plants to survive in winter conditions. This division is based on many years of studying winter temperatures.

The assignment of a plant to a particular zone is made on the basis of knowledge about the variety’s requirements for growth and development conditions. However, even within the same zone, climatic conditions may vary. It is well known that the south side of the house is always warmer, and in a place protected from the winds (for example, a courtyard or urban area), even the largest “sissies” can grow. Therefore, the given zoning of plant varieties is quite conditional.
With the help of proper placement of plants (in a warm and windless place), as well as the use of covering materials (spunbond, foliage, spruce branches, hilling, etc.) and “laying” shoots to the ground for the winter, you can increase the climatic zone of your site by 1-2 units. This also helps to improve the soil regime (for example, adding clay to sandy soils, adding organic fertilizers, covering the soil with manure, mulching with sawdust, peat, etc.). Then, for example, in the conditions of the third climatic zone, it is possible to grow varieties belonging to the fourth or fifth zone without any problems. In addition, special events such as whitewashing trunks fruit trees in November, shading evergreen plants with covering material in February or in the fall will help avoid frost damage and sunburn in conditions of sudden temperature changes and weather changes.

Frost resistance zone table:

Russia is the largest state by area, which is geographically located on the continent of Eurasia. Russian Federation has a huge extent from north to south and from west to east. Its climatic conditions are quite varied.

What are climate zones?

The main characteristic of individual zones is climate - the interaction of temperature, humidity, air currents, and solar intensity. Natural-territorial complexes have the character of latitudinal or sublatitudinal strips encircling the entire territory globe. They differ in climatic conditions, soil cover, relief features, flora and fauna. Climatic zoning is used on the territory of Russia. The state is located in the following zones:

• arctic;
• subarctic;
• moderate;
• subtropical.

Territorial division

The first belt covers the islands, as well as the coast of the Arctic Ocean. The territory located from the East European Plain and Western Siberia to 60 degrees north latitude is dominated by a subarctic climate. Most of Russia is located in the temperate zone. Which can be divided into:

• temperate continental,
• continental,
• sharply continental,
• monsoon.

The territory of the European part of Russia is located in the temperate continental climate zone. Western Siberia and the territory of the extreme southeast of the East European Plain are located in the continental climate zone. The territory of Central Siberia is a zone of a sharply continental belt. The Far East is characterized by a monsoon climate.

The smallest area is located in the subtropical climate zone. This is the Black Sea coast.

Delimitation of Russian territory

The climatic zones of Russia can be determined using a special temperature map. The territory on the map is delimited into regions with similar natural conditions. Each region is characterized by an average annual minimum temperature range. The dates of the first autumn and last spring frosts can also be additionally indicated.

The natural and climatic zones of Russia are located in the temperature spectrum from minus five in the warmest regions to minus sixty in the coldest. You can determine the region in which the area you are looking for is located simply by looking at the map. Or, if greater accuracy is required, you can calculate it yourself by obtaining the arithmetic mean of temperatures in the selected zone over the past ten or more years.

Perpetual frost zone

The first climatic zone of Russia is tundra or arctic and subarctic. It includes most of the Republic of Sakha (Yakutia). Thus, in its eastern part, average annual temperatures prevail, reaching minus forty-five degrees Celsius. 1 climatic zone of Russia is characterized by very cold, long, little snow winters and short, relatively warm summers. This zone is characterized by a short frost-free period. This condition has a huge impact on the development of flora. They grow in this zone dwarf trees and shrubs.

For growing crops, this climatic zone provides only a few warm summer months, during which the permafrost retreats and frees up small patches of land for planting for the most persistent and inventive farmers. But nevertheless, the widespread use of greenhouses, frost-resistant and early-ripening crops makes it possible to harvest almost all known vegetables and fruits even in these harsh conditions.

Taiga climatic zone of Russia

The vast territory can be classified as the second climatic zone. This is almost the entire territory located between the European part in the west and the third climatic zone in the east, stretching along the entire coast. This zone is located from Karelia to Kamchatka. Winter temperatures are moderate. However, the territory located in the east of this zone has more severe winters. Thus, in Eastern Siberia there is little snow and severe winter period accompanied by a drop in air temperatures to minus forty or forty-five degrees Celsius. Russia's climatic zone 2 is characterized by very severe weather conditions. Increased dampness promotes the covering of the soil with mosses. The soil is cold and wet. Near bodies of water, the soil temperature is somewhat warmer, but this is not enough for the production of grain crops. Severe freezing of the ground in winter can also be considered a complicating factor.

Forest-steppe and steppe climatic zones of Russia

Climate zones three and four include the most densely populated part of the country. This strip is located all the way from Murmansk and Arkhangelsk regions almost throughout European part Russia to the border with Kazakhstan and ends in the Altai Republic.

Also, climate zone 3 of Russia covers the Far Eastern regions of the country along the entire eastern coast and includes parts of the regions. These are the Chukotka Autonomous Okrug, Kamchatka Territory, Magadan Region, Khabarovsk Territory, Sakhalin Region, Primorsky Region and the Jewish Autonomous Region. The area is dominated by a monsoon climate. Cold, snowy winters give way to cool, wet summers. Frequent fogs and typhoons are typical.

Steppe - 4th climatic zone of Russia. Territorially includes the Lower and Middle Volga region, North Caucasus, Southern Urals. As well as the southern regions of Western and Eastern Siberia. This zone is characterized by little snowy winters and dry summers. IN central Russia we can distinguish the territory adjacent to the shores of Lake Baikal. Here, due to geographical factors, a kind of temperature oasis was formed.

Dry steppe climate zone

This region is geographically located from the Eastern Ciscaucasia to the Subural Plateau. The fifth climatic zone also includes areas of the Kulunda steppe and territories located in the intermountain basins of Tuva and Transbaikalia. This area is characterized by dry summers with moderate temperatures. Winter frosts heterogeneous throughout the territory. In the eastern regions of the fifth zone, more severe winters are observed.

Climatic zones six to nine

Based on the map of climatic zones of Russia, built on long-term observations and analysis of temperature regimes various parts country, we can say that the entire territory of the country is located in temperature regions from the first to the ninth.

Climate zones Russia 6-9 include mainly the southwestern regions of the country. These natural complexes can be characterized as follows:

• 6- desert-steppe;
• 7-desert;
• 8-foothill semi-desert;
• 9-mountain.

The belt, extending from the sixth to the ninth zone, provides the most favorable conditions on Russian territory. The southern coastal region along the Caspian Sea can be classified as zone seven, and the warmest one - six.

The southeastern region of the Russian Plain and part of the Caspian Lowland are occupied by deserts and semi-deserts. These climatic zones of Russia are characterized by high summer temperatures and low winter temperatures. A small amount of precipitation affects the aridity of the climate. This zone is characterized by drought-resistant flora.

In the desert and semi-desert zone special place occupies the area of ​​the Volga delta and the Akhtuba floodplain. The life-giving moisture of the river turns the area into a green oasis.

The warm, mild climate of the Caucasus allows this territory to be included in zones nine and eight. They can be characterized by fairly mild and warm winters. Temperature This period practically does not reach the negative temperature range. This factor contributes to the rich diversity of vegetation.

In conclusion

The climatic zones of Russia are diverse. Knowledge of each of them is indispensable for everyday life and is used in a wide variety of industries. Certain natural conditions impose certain restrictions both during construction and when using this or that equipment. When conducting economic activities, the climatic conditions of the zones must be taken into account. The nature of Russia continuously challenges man, trying to test his volitional and spiritual qualities. But, without a doubt, no matter how difficult the conditions may be, no matter what dangers may be hidden, a person will always find rational decision and exit from difficult situation, and the earth will be covered with sprouts of young plants, new buildings will appear, and nature will submit to man.

Zoning cultivated plants, is directly related to the definition of the so-called frost resistance zones - climatic regions to which they can correspond, as acceptable, from the standpoint of planting extensive (industrial) plantings. This concept is more strict than the general possibility of introduction various types plants, which allows for more extensive experiments under favorable microclimate conditions.

IN currently, the generally accepted international (American) classification is USDA zones, which contains 11 such gradients with transitional subzones a) and b) (), which, despite its limited flexibility, is still quite often used in our country as a guide.
Most of the territory of the temperate zone (middle zone), with active agricultural activities, fits into the indicators of 3-7 climatic zones of frost resistance. Broad prospects for the introduction of various foreign crops temperate climate starts from zone 5, which corresponds to the scale of the average of the absolute minimums: −23.3 °C .. −28.9 °C

There is confusion in the understanding of these critical indicators for determining frost resistance zones, which are used in agrometeorology for agroclimatic zoning.
The first principle design parameter- this is an indicator of the absolute annual minimum, characterizing a short-term (from several hours or more) setting of cold fronts, which can lead to significant freezing or complete death of the plant. It can be considered only in the context of a limited time frame - either for the period of all currently available observations (often, this is no more than 60-80 years of history), or within the initially specified framework: the latest climate norm - a period of 30 years of observations, or arbitrarily given period - 20, 40 or more years. To take into account the latest dynamics of climate change, a period of up to 10-20 years is considered. Considering what has been said, an answer in the spirit of “we don’t have -40” is not correct by definition; in the general case, such words do not characterize anything.
Another calculated parameter is more indicative - the average of the absolute minimums (as a rule, it is 1.5 times less than the previous indicator). To calculate it, absolute minimums are taken for each year, for the required period (usually over the last 10-20 years of observations) and averaged. This parameter is accepted as the unit of account when determining USDA zones.

Let's look at an example.
Let's take the absolute minimum data (Tn indicator) for the State Botanical Garden (GBS) of Moscow (the observation station at the All-Russian Exhibition Center is located several kilometers from the southern entrance), as a data source we will use the resource - http://rp5.ru/, look in the sections: Weather archive at the weather station / Weather statistics:
2005 .. -21.5 °C
2006 .. -30.8 °C
2007 .. -23.0 °C
2008 .. -18.3 °C
2009 .. -22.1 °C
2010 .. -25.9 °C
2011 .. -26.4 °C
2012 .. -28.5 °C
2013 .. -18.3 °C
2014 .. -25.4 °C

We get: the average of the absolute minimums over the last 10 years of observations will be (add all values ​​and divide by 10): -24 °C
Using the table of values, we will determine for Moscow GBS compliance with frost resistance zone 5b, which is typical only for the microclimate conditions of the city (the general frost resistance zone for the Moscow region will be an order of magnitude lower).

This frost resistance zone, if we take into account the latest climatic norm - 30 years of observations, runs, approximately, along the border: Minsk - Gomel - Bryansk - Kursk - Belgorod - Voronezh, which is the border, for example, of a possible industrial crop of cherries, but what else not enough for industrial apricot culture (varieties obtained on the basis of the common apricot genotype), or walnut.
One should always distinguish general recommendations on the introduction (introduction) of certain plant species within one climatic region - the zone of frost resistance, and the possibilities of a specific microclimate. As a rule, within the framework of one generalized zone of frost resistance, it is always possible to find (select): both more favorable, already transitional conditions for the next, more favorable neighboring zone, and aggravated conditions that should be perceived adjusted for one zone below. Also, the frost resistance of a tree considered as part of a forest biocenosis (forest population) and a separate open one is not the same thing. personal plot. The forest, on its own, is already the fundamental basis for the formation of microclimate and other factors that contribute to more adequate acclimatization of the species.
It should be taken into account that many non-regional plants exhibit increased sensitivity to environmental conditions uncharacteristic for them (humidity regimes, solar radiation, the nature of the change of seasons, etc.), which affects, among other things, the ability to reveal the full potential of the inherent genotypic frost resistance. For this reason, often in foreign nurseries, in relation to such foreign crops, two frost resistance zones are simultaneously designated - one for natural growing conditions (within their distribution area), and the second - in the introduction of specific local conditions, which, nominally (by default ) is set to -1 zone lower.

Work on reseeding (reproduction in generations) in new conditions of introduced species, as a rule, serves the purpose of normalizing (unlocking the full potential) genotypically inherent frost resistance, which for many plants is a realistically feasible task. But still, this reserve should not be unnecessarily exaggerated. In general, it cannot be higher than the frost resistance of a particular species, which is manifested in natural conditions along the northern border of its distribution, and certainly, it can be most fully revealed only in native conditions. So, for example, depending on the place of growth (nature of naturalization), as well as the source of seed material, in a situation of full passage of all phases of vegetation development, the manifested frost resistance of the Manchurian nut, allowing it to go through the stage of winter dormancy without significant damage to the above-ground part, can vary from - 44 °C to -52 °C and more degrees. At the same time, the ability, let’s move on to the example of the walnut, to endure winters with temperatures down to -40 °C in places of industrial culture (southern Ukraine, for example), and somewhere in the Moscow region, is completely different.
It would be more correct, as is recommended by many reference books, when determining frost resistance zones, to take into account another important interconnected indicator - the sum of active temperatures during the growing season (for the temperate zone, they most often focus on the sum of positive temperatures more than +10 °C), but this is already a topic for a separate discussion.

Mar 3, 2014 Alexei

What are USDA Hardiness Zones? What are the temperature ranges of frost resistance zones? What zone is Moscow located in? In which frost resistance zones is Russia located? – you will find answers to questions in the article.

Knowledge of frost resistance zones is often necessary when purchasing a previously unknown plant or some new variety supplied to the market from other countries. Foreign manufacturers always indicate this data on labels or other accompanying documents, thus recommending the temperature limits within which the plant can be grown. The division into climatic zones in our country was carried out taking into account many other factors, therefore it is more complex and not widespread. The USDA hardiness zone temperature scale is the most popular in the world.

Frost resistance zones are climatic regions that are determined on the basis of the average temperature value of minimum temperatures. When delimiting areas of frost resistance, synoptic data for many years is used. This vertical temperature scale is used in agriculture, horticulture, landscape design- in a word, wherever there is a change of seasons or seasonal changes in conditions environment.
First developed in the USA by the Department Agriculture(USDA - US Department of Agriculture) over time, the table has been improved and expanded. Currently, it contains 13 temperature zones, each of which has 2 subzones. Zero (in the original version) or first zone is the area with the lowest temperatures, corresponding to the Arctic region. And 11-12-13 zones are for tropical areas.

Despite some differences in the tables used in different countries, and the subjectivity of this assessment, they are used to determine optimal conditions plant growth. The most popular scale of climate zones, or hardiness zones, used in gardening guides is the USDA zone table. In 2012, the USDA hardiness zone map was updated. It presented higher minimum temperatures obtained from observations over the past 30 years, which simultaneously confirms the overall warming of the climate.

USDA zones and temperature values ​​of frost resistance zones are given in the table in degrees Celsius

However, when choosing plants, it is necessary to take into account not only climatic regions and frost resistance zones, but also other features that create a microclimate, for example, proximity to water bodies, altitude, local topography, protection from winds.

Factors and reasons affecting frost resistance zones

Not only geographic latitude, but also dozens of other factors influence minimum winter temperatures:
proximity to the ocean;
terrain;
the presence of cold or warm ocean currents;
protection from winds;
presence of hot underground springs;
plant biocenoses.
For example, in eastern Europe the climate is continental, with dry air and harsh winters. At the same time, Western Europe, being closer to the Atlantic Ocean with the warm Gulf Stream, has a humid climate with mild winters. Because of this, at the same latitude there are several frost resistance zones: from 5-6 in Eastern Europe up to 7-8 in the western part of the Eurasian continent.

Frost resistance zones in Russia range from zones 1 to 8. The largest part of Russia's territory falls into zones 2-5. This applies to both the European and Asian parts of the country. But if Central Siberia is 1-2 zones, Southern Siberia– 2, then as you approach Pacific Ocean the same situation is observed as in Western Europe. Far East- zones 3 and 4, and coastal areas, Sakhalin and some islands - zones 5 or 6.

Not only frost resistance zones and local microclimate, created, for example, by the proximity of reservoirs and topography, affect the life of the plant being grown. The microclimate can be affected big cities. In megacities, houses create an artificial barrier that prevents winds. And the availability heating systems and electricity raise the average temperature in winter by 5-8 degrees. An example is the territory of Moscow and its surrounding areas: they belong to zone 5. At the same time, the territory of the rest of the region is a clearly defined zone 4.
The depth of snow cover in winter can also be a determining factor when selecting plants. With good annual cover in zone 4, it is possible to grow plants in zones 5-6.

Below is a map of Russia and the average January temperature based on observations from 1961 to 1990. It can be assumed that the frost resistance zones (minimum temperature) of Russia will be located geographically within the same boundaries. Where purple is zone 1 (Verkhoyansk, Yakutsk), cornflower blue is zone 2 (Chita, Irkutsk, Krasnoyarsk), blue is zone 3, blue is zone 4 (Saratov, Petropavlovsk-Kamchatsky), turquoise is zone 5, green is zone 6 ( Vladivostok), light green - zone 7 (Sochi), yellow - zone 8 (Yalta).

Indicator plants

There is a so-called group of indicator plants that allow you to determine the frost resistance zone. The implication is that plants are part of natural biological communities and are not artificially grown.
Zones:
1. mosses, lichens, polar poppy
2. dwarf birch, bearberry, crowberry;
3. Siberian larch, European larch (common);
4. Thuja occidentalis, Cossack juniper, common juniper, rugose rose;
5. girlish grapes;
6. pointed yew; multi-flowered rose;
7. common ivy, evergreen boxwood;
8. yew berry; cotoneaster, holly cotoneaster;
9. cherry laurel;
10. fuchsia; tangerine, lemon, eucalyptus globulus;
11. rubber ficus, ficus lyreate, bougainvillea
12. guaiac wood;
13. royal palm.
Indicator plants cannot fully be indicators of frost resistance zones, since the plant range does not have boundaries confined to one or another zone. For example, thuja occidentalis grows in both zones 3 and 5. And cotoneaster, which is an indicator of zone 7, is grown in zones 6 and 5. Fuchsia and eucalyptus globulus, whose homeland is South America and Australia, respectively, cannot be objective indicators of frost-hardiness zones in Europe.
Below is a table of frost hardiness zones (USDA) compiled by us with examples of areas and indicator plants

Recently, the shelves of shops and markets are full of plants exotic for our country. And familiar crops are replenished with new varieties and varieties. Sellers assure that all these crops are zoned and are perfectly adapted for growing in our difficult climate. But is this really so?

The climate of our country, characterized by warm or even hot summers but cold and long winters, is naturally not suitable for all flora. Assess the ability of plants to withstand cold winter a concept called winter hardiness helps. Some (mosses and lichens) tolerate even the lowest winter temperatures, others (birch, oak) can only grow in more benign conditions, and still others (magnolia, oleander) are not at all suitable for harsh winters.

Probably everyone knows which plants are adapted to our climate. experienced gardener. But what to do with the new products on the market, how to find out whether the newly acquired green pet will survive the harsh winter? In fact, there is no problem here - in reference books, documents and on the labels of specimens from nurseries, the frost resistance zone suitable for the plant is indicated. Let's figure out what it is.

What are frost resistance zones?

Frost hardiness zones (or winter hardiness zones) are climatic regions of the globe suitable for growing certain types of plants. They are based on a temperature scale showing the average annual minimum temperature in degrees Celsius or Fahrenheit.

Currently, the most complete scale of frost resistance, used everywhere, is the so-called scale or USDA zones.

USDA zones

The USDA scale was first developed by the US Department of Agriculture for the needs of farmers and crop producers, and then the proposed zoning began to be used throughout the world. The scale includes 13 zones (from 0 to 12), each of which is divided into 2 more subzones, the boundaries of which were determined based on the minimum average annual temperatures. At first, only the territory of the United States was described, and then other countries. Now all regions of the globe belong to one or another zone on the USDA scale, and all plant species are divided according to their adaptability to different climatic conditions.

For example, a plant described as “hardy to zone 10” means it can withstand a minimum temperature of -1°C. A more hardy plant, "zone 9 hardy", can withstand minimum temperatures of -7°C, etc.

USDA zoning is currently a universal frost resistance scale used by modern farms. However, it has many disadvantages and does not take into account a number of important factors, such as:

• Snow depth. It is known that snow perfectly protects the root system of plants from frost, so crops that freeze out in snowless regions can survive well in areas where there is a lot of snow in winter.

[!] A plant breeder from Poland noticed one interesting feature: azaleas, dying from the cold in Eastern Europe, wintered well in the Moscow region, where the climate is much harsher. It turned out that the rhododendrons were protected by snow, which prevented the root system from dying.

• Temperature changes. Many crops are afraid not so much of frost as of sudden temperature changes in winter. A sudden thaw, causing the snow to melt, and an equally sudden cold snap leads to the death of the roots. This is why a number of plants, for example some types of bamboo, which can withstand severe frosts, cannot survive in our climate.

[!] In the 60s of the last century, due to such a sudden change in winter temperature (from -1°C to -29°C), the maple collection of the Moscow State University Botanical Garden was severely damaged.

• Spring frosts are another factor limiting the cultivation of heat-loving species. In our country this problem is especially relevant: in middle lane frosts can return even at the end of May.

[!] You don’t have to look far for examples. The May cold of 2017 destroyed a significant part of the grapes in Crimea.

• Average annual precipitation. Humidity is an important climatic parameter that also affects plant adaptation. For example, some crops tolerate dry, cold air well, but do not survive in humid climates.
• Other factors: the difference between day and night temperatures, terrain (presence of hills and lowlands), soil types, daylight hours, wind rose, etc.

Russia, divided into USDA climate zones, looks something like this:

Some cities in our country belong to the following zones frost resistance: zone 1 – Tiksi, Batagai, zone 2 – the greater territory of Russia, Krasnoyarsk, Irkutsk, Novosibirsk, zone 3 – Khabarovsk, Magadan, Vorkuta, zone 4 – Moscow and the Moscow region, Vologda, Arkhangelsk, Chelyabinsk, Ufa, zone 5 – St. Petersburg, Vladivostok, Voronezh, Bryansk, Saratov, zone 6 and 7 - Krasnodar.

As for labels on plants from nurseries, for Moscow and St. Petersburg you should choose crops acclimatized for zones 1-4, as well as 5a and, partially, 5b.

As you can see, USDA zoning is far from perfect, so work in this direction is constantly ongoing.

Alternatives

The flawed USDA system prompted a search for alternatives. And now they use not only the above concept, but also some others. Firstly, USDA zones have been expanded and their number significantly increased. In addition, one of the means of determining frost resistance zones was the use of so-called “indicator plants”. It is known that the range of some species is strictly limited depending on the climate, and therefore the presence of any indicator plant indicates that the territory belongs to a particular frost resistance zone.

In addition, some countries have developed their own climate maps, based on long-term meteorological observations. One of these countries was Great Britain.

In 2012, the Royal Horticultural Society of the United Kingdom presented its frost hardiness rankings. This ranking describes all plants found in the UK and is widely used by English gardeners.

The English plant frost resistance system consists of 9 parts:

• H1a (more than 15°C) – growing in a greenhouse;
• H1b (from 10 to 15°C) and H1c (from 5 to 10°C) – growing at outdoors only in summer;
• H2 (from 1 to 5°C) – crops that can tolerate a slight decrease in temperature, but are not resistant to frost;
• H3 (from -5 to 1°C) - crops that tolerate the climate of the coastal regions of Great Britain;
• H4 (from -10 to -5°C) - crops adapted to the climate of most of the UK;
• H5 (from -15 to -10°C) - crops adapted to the climate of most of the UK and can withstand a significant drop in temperature in winter;
• H6 (from -20 to – 15°C) – frost-resistant crops that can grow throughout Northern Europe;
• H7 (less than -20°C) are the most frost-resistant crops.

Frost resistance zones in the USSR and Russia

In our country, work to determine frost resistance zones began at the beginning of the 20th century, and then continued after October revolution. And, although at first the maps were imperfect, and the climatic regions were too generalized, in the 60s the work was continued: the number of zones increased to 42 (to 60 together with subzones). The work was called “Tree-cultivating regions of the USSR.” In addition to zoning, work was also carried out to divide plants found in the USSR into climatic regions. The list consisted mainly of tree crops, but the number of species included in it was very large - about 700.

Professor A.I. Kolesnikov, who led the work, summarized the data obtained in the publication “Decorative Dendrology”. This book has still not lost its relevance.

WITH detailed description You can familiarize yourself with the tree-growing regions of the USSR.

The work did not stop there, and the detailing of zoning continued. Other factors affecting the winter hardiness of plants began to be taken into account: not only the minimum, but also the average annual temperatures of the winter and summer months, average and minimum humidity, evaporation and annual precipitation. The number of frost resistance zones increased to 76, and the plants recommended for each zone were divided into three groups - “main”, “additional” and “auxiliary”:

• the main one is plants that are well acclimatized for the area,
• additional - crops that can grow in the climate zone under consideration only if good care(shelters for the winter),
• auxiliary – sporadic plants.

Unfortunately, serious government research on this topic has no longer been carried out, although both the climate and the range of plants have changed, and enormous practical experience has been accumulated. From time to time, individual farms attempt to compile similar maps, but due to lack of resources, their work is limited to certain areas.

How to increase frost resistance of plants

In conclusion, I would like to give some advice from gardening practice. With proper care, many crops recommended for more favorable climatic zones can be grown here. To increase the winter hardiness of certain species, it is recommended:

• Protect the root system from frost. This can be done using coniferous spruce branches, dry fallen leaves, peat, sawdust, and industrial covering material. Polystyrene foam, which has high heat-insulating properties, has also proven itself well.
• Cover not only the roots, but also the above-ground part of the plant. Of course, it is difficult to protect the crown of powerful tree crops (although some gardeners manage to wrap the lower part of the trunks with fabric or polyethylene), but liana-like species and plants with flexible stems should be carefully laid on the ground and covered.

[!] It is especially important to protect young crops, whose age is 2-3 years. Their root system not yet fully formed and located close to the surface of the earth.