Is iris cold-resistant? What are the diseases of iris?

1. Is it cold-resistant?

Iris has a strong ability to adapt. Its native place is at relatively high altitudes. It is naturally cold-resistant and can survive in some harsh environments. There are many varieties of irises, but not all of them are cold-resistant. For example, the German iris is less cold-resistant. Most varieties are cold-resistant and can grow in cold northern regions. They are suitable for planting in northern regions and can generally survive the winter safely. Some varieties can even grow in Russia. If you like this kind of flower, you can buy it and take it home to plant and care for it.

2. What are the diseases?

1. Black rot: Irises may be infected with diseases if not properly cared for. Fungal infection can cause black rot, which harms the leaves, causing spots to appear on the leaves, and eventually causing the leaves to dry up and fall off. Pay attention to the treatment of the disease in the early stage, and use 402 antibacterial emulsion for spraying treatment.

2. Bulb rot: This disease mainly harms the bulb part, causing the plant to become short. There are many reasons for this disease, such as invasion of pathogens or excessive dryness of the soil. The air humidity should be maintained at less than 70%, and attention should be paid to air circulation when storing bulbs.

3. Root rot: Problems in maintenance may cause irises to be infected with root rot. This disease occurs frequently around March to May each year and will harm the roots and gradually cause root rot. After the disease occurs, it should be dealt with in time, and 0.3% of thiophanate-methyl can be used to water the roots.