The flowering time of Corydalis angularis is closely related to the sowing time, and it can open two or three months after conventional sowing. Because the suitable temperature for Corydalis seed germination is 15 ℃ - 20 ℃, the normal choice is to plant in early spring, and you can enjoy the beauty of Corydalis flowers in summer. In the middle and lower reaches of the Yangtze River in autumn, the temperature is just right. In these areas, the seeds can be planted in the middle and late September, and the landscape can be formed in December. In North China, we usually choose to plant seedlings in greenhouse from January to February, and they will bloom in March to April. In hot summer, if there is equipment that can reduce the temperature, it is also a good choice to raise seedlings in summer and blossom in autumn.
The growth period of Corydalis is generally 3-4 months. Compared with Viola tricolor, its development period is relatively short, about 2 weeks. But Corydalis is very heat-resistant, generally when the sun is full, the flowering period of Corydalis will be prolonged. It can be fertilized properly in the flowering period of corydalis. Corydalis is relatively sensitive to the concentration of flower fertilizer, generally the concentration is not higher than 150 ppm. In addition to N fertilizer, K fertilizer can also be added. In the flowering period, the liquid fertilizer described above can be applied once a week. Before and during the growth period, it can promote the development of lateral branches, increase the number of flowers per plant and prolong the flowering period.
In the process of cultivation, corydalis may encounter aphids, thrips, spiders and other pests. In the process of cultivation, we should pay attention to improve the cleanliness of the growing environment, so as to avoid the above pests. And the common diseases in the cultivation process are impeller striae, downy mildew, powdery mildew, black root rot and so on. Reasonable watering and fertilization management can promote the rapid growth of plants. Generally speaking, it is recommended to water in the morning to avoid too much humidity of leaves at night. If the pH value of soil is not appropriate, it is easy to cause black root rot, and the appropriate pH value of soil can greatly reduce the invasion probability of the above diseases.
