With the promotion of the legalization of marijuana, more and more people choose to buy seeds and LED grow lights to grow marijuana. As we all know, the cultivation of cannabis is not as simple as we think: temperature, climate, soil, water seal, light and other factors are essential for the growth of cannabis. In fact, cannabis has different temperature requirements depending on the type of variety. Generally, from planting to maturity, the accumulated temperature required is 1900-2000. When the seeds are mature, the accumulated temperature is 2700-3000. For early maturing varieties, the accumulated temperature of 1600-1700. The process can be matured. Cannabis seeds can germinate when the soil temperature is above 1 °C, but it is necessary to sow when the soil temperature is above 8-10 °C. The optimum temperature for cannabis seed germination is 25-35 ° C. When the temperature is high, the germination is fast and uniform, and the highest temperature is not more than 45 ° C. Excessive temperature is easy to burn the seeds. Cannabis seedlings can withstand short-term low temperatures of -5 ° C, but this can seriously affect their growth process. The most suitable growth temperature: seedling stage is 10-15 °C; rapid growth period is 18-30 °C, 19-25 °C is the most suitable; flowering to seed maturity is 18-20 °C, flowering period meets -1 °C low temperature, then The flower is damaged, and the flower is dead below -2 °C, especially the male flower. Seeds can withstand 3-5 ° C low temperature and lower temperature within 10-15 days after germination; at -5 low temperature, its growth will be delayed. However, if sufficient water and nutrients are available, the low temperature at the seedling stage will have little effect on future development and yield. Cannabis is not resistant to low temperatures during flowering, and it is prone to death during the flowering period, and it is easy to die. During the growth period, the average temperature around day and night has a great influence on the growth of cannabis, especially from the bud to the end of flowering, the growth of stems is the fastest, and the dry matter is greatly increased; during this period, the best temperature should be maintained at 16 (evening)-25 °C (daytime) or so. With the use of LED plant lights, indoor cannabis cultivation can better control the temperature required for cannabis by hand. Regardless of the planting method, we should be careful and caring for the cannabis in planting.
