1、 Soil

It is best to use soft and fertile soil for breeding black and purple sunflowers. The soil viscosity should be small. Peat soil is best used for sowing

2、 Illumination

Black and purple sunflowers like sufficient light. If they are cultured indoors, they need to be cultured on the balcony to avoid shade and semi shade. Insufficient sunlight will lead to problems such as soft leaves, weak stems and small flower plates

3、 Temperature

Black and purple sunflower has strong adaptability to temperature and likes a warm environment. The most suitable temperature for growth is 18-30 ℃. It can grow healthily in an environment of no less than 10 ℃. If the temperature difference between day and night can be kept within 8-10 ℃, it is more conducive to the growth of stems and leaves

4、 Watering

In the seedling stage and vigorous growth period, water more, 2-3 times a day, but drain in time to avoid ponding, so as to avoid root rot. Water properly during flowering to avoid drought and waterlogging

5、 Fertilization

Black and purple sunflowers like sufficient nutrients and topdressing once every 7-10 days during the growth period. The seedling stage is dominated by nitrogen fertilizer. Adding some phosphorus and potassium fertilizer after the emergence of flower buds can help the development of flowers and facilitate flowering. Proper supplement of fertilizer can prevent thin branches and leaves and withered and yellow leaves

6、 Pest control

Spraying insecticides in time in the process of breeding or exterminating the soil before planting can effectively control the occurrence of diseases and pests. If pests are found, they should be handled immediately to avoid greater damage to plants