Are your vegetables okay? Anti-cold measures for home gardens!

Cold tolerant vegetables and weak vegetables

Depending on the vegetable, cells can freeze and die when exposed to cold or frost. Therefore, when the temperature is likely to drop below 0 degrees C, when there is a possibility of frost after checking the frost forecast or when it turns cold suddenly into the evening, cold susceptible trees need harvest. early or take anti-cold measures. It is necessary to go and so on. First of all, I will introduce which vegetables are good against cold and which are weak, please remember.

Vegetables are susceptible to cold

It is particularly susceptible to cold and will soon die if exposed to frost. It is important not to take anti-frost measures but to harvest before the first frost.
However, the leaves of sweet potatoes and potatoes will die in the cold, but potatoes do not freeze if they are covered or buried about 15 cm in soil. I think it depends on the area, but Kagoshima, where I live, also froze several times, but it didn’t rot even if I left it in the soil until spring.

Vegetables are slightly cold

It doesn’t die from just one cold or frost, but multiple frosts can damage the leaves and cause some necrosis. Prevent damage by taking measures to prevent soil from freezing and exposing to frost. Also, keeping it warm can speed up growth slightly.

Cold tolerant vegetables

Some leaves may be damaged by cold, but all will not die. To prevent cells from clotting increases the concentration of sugar inside the cell, so the sweetness increases. These remedies do not require any special measures to combat the cold, but they can be done if you want to increase the rate of growth or if you don’t want to be crushed by snow.

Measures to protect cold

Introduce specific anti-cold measures.

Cover vegetables (cover)

This is a mulch method to keep vegetables away from cold wind. In both cases, if there is a gap where the wind enters, it can be blown by the wind, so please install it so that it will not be blown away by placing soil or rocks on top.

That is the method of erecting arched columns to form a tunnel. Because of its skeleton, you don’t have to worry about the vegetables being crushed by snow. This method is suitable for slightly taller things, such as soramame, turnips, carrots, and broccoli.


It is a method to cover vegetables as they are. The installation is easy as there is no need for a stand, but be careful because the vegetables can be crushed by snow or the wind can crush the vegetables. If the material is allowed to pass through the rain, it will not be weighed down by the weight of the rain. This method is suitable for leaves like komatsuna and spinach.
The fibers are wound together without breaking and compressed into a sheet, which can be expected to provide heat retention, frost protection and insect resistance. It is very light and has high light transmittance making it very suitable for applying. The problem is the reasonable price.

As a mesh fabric, besides the effect of keeping heat, anti-fog, and anti-insects, it is also used to shade the sun in the summer. There are many different mesh sizes, and the finer the mesh, the higher the heat-holding effect, however ventilation and light transmission will decrease. Available in white and black, but in winter use white so the light can easily pass through.

This type of mesh is for insect control, and comes in a variety of mesh sizes, so you can choose the type of insect you want to target. Insects don’t like things that reflect sparkle, so many of them weave silver threads. This insect repellent mesh can be expected to not only repel insects but also provide heat and frost protection. However, since the mesh is larger than the non-woven fabric, the heat retention effect is reduced.

The transparent vinyl does not let the cold pass, so it’s especially good to keep warm during the day. However, care should be taken because the interior can be colder at night when the radiation cools strongly by not allowing air to pass through. When radiant cooling appears to be strong, only open the lower part so that wind can pass through. It is not suitable for sticking as it is heavy and it is not well ventilated.

Land cover (marting)

If the soil freezes or gets too dry in cold weather, the vegetables will spoil. The effect will vary depending on the material covered. In the following, we will introduce two commonly used materials.

The black ones are used for mulch in winter. It is characterized by the fact that the soil temperature tends to increase during the day because it does not allow air to pass through, and it is highly effective in weed control.


Since these materials feed the soil microorganisms, they are also a major feature of the tillage process. In addition, by placing it thicker, the insulation effect will be higher than that of vinyl film, so changes in soil temperature can be prevented. Compared to vinyl, it is less effective at controlling weeds, but it is recommended for winter use as weeds do not grow much in the first place.

What if the vegetables freeze in frost?

When vegetables experience frost, they can freeze and frozen parts become dull. This is true even for cold tolerant vegetables. If you harvest in a frozen state at that time, the frozen portion will be necrotic, so be careful. If the sun shines on and thaws, the frozen cells regenerate, so wait until then.

In winter, it doesn’t take as much time to mow the lawn as it does in summer, so if you take measures to protect yourself from the early cold, you can grow vegetables very easily. Take the time to enjoy the vegetables grown until harvest.

◆ Next time I will talk about how to clean vegetables. Not only cleaning, but preparing for the next vegetables will make a big difference in the quality of spring vegetables. expected!