Iris doesn't have high requirements for the environment. It can be planted in spring or autumn. Iris for soil requirements is not high as long as the drainage is good, to ensure a certain humidity on the line. It is necessary for some iris soil with short growth cycle to be good. If it is in heavy soil, adding some peat, vermiculite or coarse sand can improve the soil.
The soil temperature is very important. The minimum temperature is 5 ~ 8 ℃, and the maximum temperature is more than 20 ℃. The temperature of soil will affect the emergence of iris. The optimum temperature is 16 ~ 18 ℃.
Iris is planted in the greenhouse. The optimum temperature is 15 ℃. The temperature in the greenhouse was kept at 18 ℃ for the first three weeks or so. The growth period of iris will be prolonged at 13 ℃ or in the acceptable low temperature, and the weight of iris will be increased at the same time, but the flowers are easy to wither.
In autumn, the greenhouse should be well lit, and the temperature in the greenhouse should be lower to prevent the flowers from withering. The best temperature is 10 ~ 13 ℃. The pruning of leaves should be considered in plant growth stage.
The average temperature of day and night is 20 ~ 23 ℃, and the low temperature is controlled within the acceptable range of iris. High temperature and little sunshine are the important reasons for the withering of flowers.
In some areas prone to frost natural disasters, the cultivation process is best in the greenhouse. The growing temperature is better at night. Greenhouses without temperature control should be closed earlier, which will make the temperature at night more suitable for the growth of iris. In the daytime, ventilation should be done as early as possible to prevent damage to iris when the temperature exceeds 18 ℃. Shading the sun is one of the means of temperature control, but the right amount of light should be maintained.
Equipped with a good drainage system, water can be more fully used by the soil. In this way, the problem of salt accumulation caused by less water can be solved.
The method of applying fertilizer before planting iris will cause its root to grow slowly. Fertilization is simply to adapt to local conditions. Different land uses different fertilizers. Iris can't use phosphate and triphosphate. Diphosphate fertilizer can be used.
It takes eight to twelve weeks for iris to grow. After soil treatment, there is no need to worry about weeding. After iris is planted, herbicides are generally used to remove weeds. But be careful not to damage the iris.
The storage temperature of the seed ball must be 30 ℃, and the cut flower seed ball must be planted immediately. If it is not planted immediately, it shall be stored in a proper temperature. In order to meet the growth requirements of the ball, the temperature must be adjusted frequently to ensure the growth of the ball. Keep the temperature at 2 ℃ for no more than 2-3 weeks, which is the best choice. The storage temperature higher than 2 ℃ will prolong the treatment time and play a negative role in flowering. Place the bulb in the bottom of the empty container. Storage temperature at 2 ℃ to maintain good ventilation. The seed ball is not suitable for long-term storage. The long storage time is not good for the growth of stem and leaf, but also easy to be infected by Penicillium.
It is very important to keep enough water supply for cut iris during the planting period. A few days before planting, it is wet enough to ensure the rapid growth of roots in the early stage, and the roots are not easy to be damaged during planting. It is suitable to irrigate the soil with cold water when the soil temperature is too high. When the soil temperature is high, the seed ball will grow quickly and the quality of cut flowers will be poor. When planting, it is better to choose the place with low soil temperature. When summer comes, covering the ground with heat-insulating materials can prevent excessive sunlight radiation.
