Originally Posted by Buttercup726
Going on my third round with my current problems. During veg my plants would look nice and healthy, lucious and green. First couple of weeks into flower the problems would start religiously. Leaves yellowing early on and looking rusted. By the time it came to harvesting my plants would never fully mature. I would let them go for an extra week or two and still wouldn’t finish.
1. Check inside your grow tent for light leaks. Just sitting in a closed grow tent for 10 minutes will show you any light leaks.
2. Nutrient deficiencies lead to a delay in growth.
From mid-flowering onwards, weed needs more:
Potassium - branching and stacking buds, overall health
Silica - resin and an anti-feedant for insects
Sulfur - terpenes, which also act to confuse insects
Calcium - for cell growth
Basically the absence of these nutrients in flowering will slow growth, reduce resistance to insects and infections at the same time.