1、 Cold resistant

Iris has strong adaptability. Its native place is at a relatively high altitude. It is naturally resistant to cold and can survive in some harsh environments. There are many varieties of iris. Not all varieties are cold resistant. For example, the cold resistance of German iris is worse. Most varieties are cold resistant and can grow in cold northern areas. They are suitable for planting in northern areas. Generally, they can survive the winter safely. Some varieties can also grow in Russia. If you like this kind of flowers, you can buy them and cultivate them at home

2、 What are the diseases

1. Black rot: iris may be infected by improper maintenance. Fungal infection will cause black rot, endanger the leaves, cause disease spots on the leaves, and finally lead to the drying and falling off of the leaves. In the initial stage, we should pay attention to the treatment of the disease. 402 antibacterial agent emulsion can be used for spraying treatment

2. Seed ball rot: this disease mainly endangers the seed ball part and causes the plant to become low. There are many causes of the disease, such as bacterial invasion or soil drying. The air humidity should be kept well, which should be less than 70%. Pay attention to the circulation of air when storing seed balls

3. The root rot disease occurs in March to May every year, which may cause multiple root rot. After the occurrence of this disease, it should be treated in time. 0.3% of Tuvalu can be used to irrigate the root