So your 5 weeks from harvest and your leaves are beginning to turn purple. This is by and large brought on by a sudden phosphorus deficiency. On the off chance that the temperature dropped to 50 degrees (F.) your plant will increase the up take-up of phosphorus and that will make plants turn purple .Cannabis plants tend to love phosphorus in the blooming/growing stage in the event that you are utilizing legitimate growing supplements this shouldβnt be an issue as most nutrient has more then enough phosphorous.
Phosphorus is utilized vigorously by cannabis plants in the blooming stage to create the buds, and is a urgent segment of photosynthesis (transforming light into vitality for the plant).
A few strains of cannabis utilize a great deal more phosphorus than others, or the reverse some can be more vulnerable to a phosphorus inadequacy, and you may have many plants in precisely the same with just a portion of the plants hinting at a phosphorus lack.