The purpose of spring pruning is to promote the growth of new branches and concentrate nutrients. When pruning, it is necessary to cut off the top of the most prosperous main branch to avoid the top advantage. If the lateral buds grow too thick, you need to comb them a little to concentrate nutrients.
Spring is its growth period, and it consumes a lot of nutrients. It can't meet its needs only by the nutrients in the soil. If it is a newly planted plant, because the soil already has base fertilizer, it is necessary to increase the interval of fertilization to avoid fertilizer damage. Old plants need 15 days to apply fertilizer, fertilizer should use fertilizer with low efficiency, the purpose is to avoid fertilizer damage.
During the growing period, there is a large demand for water, which needs to be watered every day. The temperature in late spring is relatively high, and daily watering can't meet its needs. It needs to be watered in the morning and evening every day, that is, twice a day. The amount of water need not be too much, to ensure that the soil is completely wet without water.
In spring, the demand of cornflower for sunshine is large, and the time of daily sunshine should not be less than five hours. The light in late spring is quite strong. It can be normal in the morning and afternoon, but the sun is too strong at noon. It needs proper shade