How to protect roses in winter

When it comes to winter, the first thing people think of is “cold”. Indeed, with the arrival of winter, people are always too lazy to move and just want to curl up in bed and sleep all day. In fact, it’s not just us, even crops will be “sluggish” in winter – growing slowly. If we do not take adequate measures to prevent cold and heat, it will easily cause frost damage to crops, leading to harvest failure and causing us to suffer in vain.
Roses are a common economic crop in Yunnan. They have relatively developed root systems and strong adaptability. Even so, roses are afraid of cold winter. When the temperature is below 0℃, the “tops” (buds) and Plants will suffer from freezing damage, which will cause plants to wither and flower buds to fall off. Once the “tops” wither and fall off, not only the rose yield of the season will be lost, but also a large amount of fertilizer costs, pesticide costs, labor costs, etc. Therefore, doing a good job in preventing cold and keeping warm in winter is an important link that cannot be ignored in the rose management process.

Since roses are cash crops, they have high economic value and are relatively delicate. We need to build a greenhouse for roses before planting them. Therefore, there are generally 5 methods for keeping roses cold-proof and warm. They are:
1. Repair the shed and repair the film
2. Cover with double film
3. Install sunshade net
4. Add a stove
5. Apply top dressing

Repair shed and film

After years of wind, sun, and rain, the greenhouse film is prone to damage. Once the greenhouse film is damaged, it will not only cause cold air to enter the greenhouse, lower the temperature inside the greenhouse, and cause frost damage to the roses; it will also cause frost damage to the roses. In summer, the temperature difference between the inside and outside of the greenhouse causes roses to suffer from a series of diseases and insect pests such as white powder and spiders. Therefore, by repairing the shed film, we can play three roles: first, to increase the temperature inside the shed and prevent cold air from entering the shed; second, to strengthen the greenhouse to prevent excessive snow from crushing the greenhouse; third, to reduce the temperature difference between the inside and outside of the shed, Prevent the breeding of rose diseases and insect pests.
There are three methods for repairing shed membranes, namely glue patching, sewing and heat patching. However, since the rose shed is difficult to build and dismantle, it is not recommended to use the heat patching method; and because the seam patching method will cause air leakage, And the shed film is easy to be pulled apart, so in the process of repairing the rose shed film, we generally use the glue repair method. That is, clean the dust around the hole with clean water, wait for the water to dry, apply a patching film and water it, and take a clean film of the same texture and stick it on, smooth it around to prevent air from entering, and wait until the glue is completely dry. Can be stuck firmly.

Supplementary instructions: When using the glue patching method to repair the rose shed film, be sure to choose a sunny day at noon, and try to avoid repairing in the morning or evening. The reason is that if you repair the shed film in the morning or evening in winter, dew will appear on the shed film ( Frost), the glue is not easy to stick firmly. At the same time, you should also avoid rainy weather or snowy weather. The reason is the same as choosing to repair the shed film in the morning or evening. In addition, in order to save economic costs, transparent tape can be directly attached to the damaged film to achieve the effect of repairing the film.

Covered with double film

People who observe carefully will find that after winter arrives, experienced farmers will add a layer of film around the greenhouse to create a double-film covering effect. The purpose of double-film covering is threefold: first, there will be air between the two films, which can reduce heat transfer and significantly increase the temperature in the shed. This is the same principle as the two walls of the kettle will play a thermal insulation role; second, there will be more Film protection reduces the possibility of cold air entering the shed, which is the same reason why we wear an extra layer of clothing. Third, multiple membranes bear stress together, and the greenhouse membrane’s resistance to wind and snow is enhanced, which can effectively prevent the greenhouse from collapsing. Therefore, we can also use this method to keep roses warm.
For the roof of the rose shed, we can add film inside the shed to keep the roses warm, which can also reduce heat transfer and prevent heat dissipation in the shed. However, adding film in the shed also has advantages and disadvantages: the advantage is that it is easier to install in winter and disassemble in summer; the disadvantage is that it will reduce the light transmittance in the shed and easily reduce the quality of the roses.
Supplementary instructions: When adding film around the rose shed, be sure to tighten it up and down. It is best to use ropes to fix the film on the pillars to prevent the film from blowing in strong winds.

Install sunshade net

Some people may have questions: “If installing a sunshade net in a greenhouse, won’t it reduce the light intensity and temperature inside the greenhouse? Wouldn’t it be detrimental to roses’ protection from the cold and warmth?” In fact, by installing sunshade nets around the rose greenhouse, we can achieve four purposes: first, to protect the greenhouse film and prevent it from being damaged in snowy and rainy days in winter; second, to absorb sunlight and convert it into The reason is that the sunshade net is black, and black can absorb light; the third is to add a “protective layer” to prevent cold air from entering the shed; the fourth is to increase soil moisture and reduce the amount of water in the soil. The evaporation of water saves the trouble of frequent watering and reduces the possibility of low soil temperature caused by frequent watering.
When installing a sunshade net on a rose shed, you only need to install it around the greenhouse. It is absolutely not allowed to add a sunshade net on the roof. There are two reasons: ① The rose shed is relatively high (old shed: 2.8 meters; new shed: 2.8 meters). : 4.0 meters), and the endurance of the shed membrane is limited. Adding a sunshade net on the roof is not only dangerous, but also easy to break the roof membrane, which is not worth the gain. ② Adding a sunshade net on the roof of the shed is not conducive to increasing the light and temperature in the shed; it is also not conducive to photosynthesis and transpiration of roses. In addition, due to the higher temperatures and stronger sunlight in summer and autumn, we usually install a sunshade net in the rose shed. But with the arrival of winter, we must remove the sunshade net in the shed in time to prevent insufficient light from affecting the quality of the roses and affecting the soil temperature.
Supplementary explanation: In order to save costs, we can use corn straws or straw curtains instead of sunshade nets. That is, before the cold winter comes, we can spread corn straws or straw curtains evenly around the flower shed to block wind and rain, and This will increase the temperature inside the shed (1-2°C).

Add a stove

The purpose of adding a stove in the rose greenhouse is to use the fire to heat the greenhouse. Fire heating is a traditional heating method commonly used by flower farmers in winter. It uses two principles: First, firewood or charcoal will release heat and produce carbon dioxide after burning, which will increase the temperature inside the shed (1 -4℃). Second, firewood will also produce a large amount of smoke during the burning process. Smoke can prevent the heat in the greenhouse from radiating outward and reduce heat dissipation.
The method of adding a stove to increase the temperature in the shed has a small investment and is easy to operate, but it also has two disadvantages: first, the labor input is large, and it generally needs to be used at night when the temperature is low; second, the heat generated by the stove fire Dust and gas will harm the growth of roses and our human health. Therefore, it is not recommended to use this method unless it is absolutely necessary (the temperature in the shed is below 0℃).
Additional explanation: Since insufficient combustion of firewood or charcoal will produce toxic carbon monoxide, after we use the method of adding a stove to the garden shed to prevent cold and heat, we must open the shed door at noon the next day to allow air circulation. To prevent poisoning when working in the shed.

Apply top dressing

Applying top dressing to roses in the cold winter is the simplest way to prevent cold. The principle of its use is to enhance the cold resistance and disease resistance of roses through top dressing, and prevent the “tops” of roses from freezing damage and diseases. In addition, through top dressing, it can also meet the nutrient needs of roses during their growth, increase the weight of petals and the size of buds, improve the quality of roses, and prevent roses from fertilizer deficiency. It can be said that it kills two birds with one stone.

Daily management of flower fields

For the method of fertilizing roses in cold winter, it is recommended to use foliar spraying. As for the choice of fertilizer, potassium dihydrogen phosphate is undoubtedly the best for the following reasons:
① In the cold winter, the root system of roses is not active. Fertilizing outside the roots is a process that needs to be absorbed slowly, and its fertilizer effect is slow. However, the foliar spraying method can quickly prevent cold and keep warm.
② During the budding stage, roses have the highest requirements for phosphorus and potassium fertilizers, and potassium dihydrogen phosphate contains a large amount of phosphorus and potassium elements, which just meets the growth needs of roses.
③The potassium element in potassium dihydrogen phosphate can improve the cold resistance of roses and prevent frost damage to the “tops” of roses.
④Potassium dihydrogen phosphate can promote nutrient absorption, photosynthesis, and root growth of roses. It can improve the yield and quality of roses.
Supplementary explanation: When spraying potassium dihydrogen phosphate on roses, you can put some brassinolide into the fertilizer. Brassinolide is a crop improvement agent. It can not only improve the quality of roses, but also improve the quality of roses. It can also increase the yield of roses; it can also improve the cold resistance of roses. When used in combination with potassium dihydrogen phosphate, the cold protection effect is better.

Fertilize roses to improve their cold resistance

Some people may say: “Methods such as covering with plastic film and building small sheds can also play a role in preventing cold and keeping warm. Why are they not recommended?” In fact, roses are perennial cash crops, and their management is troublesome. They need to work in the shed all year round – weeding, fertilizing, watering, loosening soil, pruning, etc. During work, it is easy to Damage to the mulch and arches. Once the mulch and arches are damaged, they will no longer be able to prevent cold and keep warm. This will only increase our expenses invisibly, and the gain outweighs the loss.
In the cold winter, with proper management, roses can still bloom in winter!