The soil of Viola tricolor needs to be fertile, loose and well drained, with a pH of 5.4-7.4.
It is very sensitive to light. When the light is sufficient, its stems and leaves are luxuriant, flowers are dense, flowering time will be advanced, and flowering period will be longer. However, the lack of light will lead to poor flowering, and it needs to receive more than 4 hours of light every day.
It likes wet soil environment and is not drought resistant. When growing, it should pay attention to keep the soil moist, but do not accumulate water. It is better to dry slightly at seedling stage to prevent diseases and insect pests.
The optimum temperature for its growth is 15-25 ℃, and the optimum temperature for its growth at night is 3-5 ℃. Do not put in the environment above 25 ℃ for a long time, or the plant will be difficult to bloom and cause excessive growth, even if the result of its seeds will also be stunted and difficult to survive.
When applying fertilizer, pay attention to thin fertilizer and apply it frequently. At the beginning, apply nitrogen fertilizer, such as urea, etc.; near the flowering stage, apply phosphorus fertilizer, and at the pregnancy stage, apply 0.2% potassium dihydrogen phosphate aqueous solution, reduce fertilization after flowering, and maintain in time..
