Key points of fertilization

1. There is no need to treat the soil with base fertilizer before planting iris, because the iris has not yet grown roots that can absorb nutrients. On the contrary, this will greatly increase the salt content in the soil, resulting in the slow growth of iris roots

2. When the iris grows about 4 leaves, it can restore Hefei. At this time, fertilization can prepare for flowering. Iris blooms from April to June

3. When fertilizing iris, do not use fertilizers containing triphosphate and fluorine, because iris is more sensitive to fertilizers with fluorine. Other relevant fertilizers can be used

4. Fertilization should be conducted once or twice before flowering or germination. The fertilizer can be mainly compound flower fertilizer or rotten thin fertilizer, because it will consume a lot of nutrients during flowering and improve the ornamental value of flowers. After the flowering period, that is, after the flowers wither, topdressing should also be carried out. Because too much nutrients are consumed during the flowering period, topdressing can ensure the normal growth of plants after flowering and withering

5. Fertilization should be carried out once a year in autumn. Potassium and nitrogen organic fertilizer can be applied, which can improve the cold resistance of the iris and strengthen the resistance to diseases and pests. In the dormancy stage of iris, fertilization can be avoided