The Mega Crop version 1 does not supply the plants with enough P and K in flowering. Several I grew before I started using the FF flowering supplements showed P and K deficiencies during mid to late flowering. My understanding this problem was addressed by MC with their version 2 nutrients. Here is a couple buds I harvested today from a GG#4 plant I have flowering. First time growing this strain so I wanted a couple sample buds (she is flip + 60 days today) at this stage to compare them to the buds at flip + 70 days which is when I anticipate I will harvest the tops of the plant. I think the MC + FF does a good job.