Jianlan sprouts several times a year.

Under the conditions of suitable temperature, humidity, light and reasonable nutrition, most species of Chinese orchids can grow 2 or 3 times of new buds. Usually under suitable growth conditions and environment, it takes about 90 to 120 days for Chinese orchid to sprout to form a plant. People found in the cultivation of orchids: where new buds were unearthed at the beginning of April, the second new buds were unearthed in mid-late June. The first batch of new buds basically matured after 90 days of growth. The second batch of new buds also formed strong plants after 120 days of growth from July to October. It is theoretically possible to calculate the growth of three batches of new buds in 365 days throughout the year. In fact, however, this is not the case, because the seedlings in the next year are often not strong enough, and they have to continue to grow next spring, delaying the germination of new buds until May to June. When the new buds were unearthed and grew in the high temperature season from July to September, the orchid plant grew slowly. After summer and short autumn, after mid-November, the temperature is getting lower and the orchid vegetative growth is slow, so that after a year, immature new seedlings have to wait for the coming year. Year after year, a batch of seedlings fail to grow. It can be seen that the germination of new buds of orchids is related to the climatic conditions suitable for the growth of orchids. The number of new buds sprouting depends on the number of days in a year that are suitable for orchids to grow reasonably. The more days provided, the more batches sprouting will be. In the middle and lower reaches of the Yangtze River, there are 24 solar terms in a year. In normal years, Grain Rain to the Summer Solstice is more suitable for orchid growth, a total of 75 days. White Dew to Cold Dew a total of 45 days, also suitable for orchid growth, a total of 120 days, these time is enough for orchids to grow into seedlings. The reason why seedlings can not grow to maturity once a year must be due to problems in management and cultivation. In fact, it is not difficult to grow 2 batches of seedlings a year. If we can make use of 30 days in early spring and 60 days in summer (using artificial cooling), we can obtain another batch of seedling growth cycle. Therefore, improving the environment of orchid cultivation and artificially creating a microclimate suitable for orchid growth can make orchids sprout more.