We`ve been messin with the GDP for about 4 years now. Tried MANY different ways with her and found this was best for us. Had a couple bust the 9 zip mark but most are in the 7-8 range. We do have the Ken`s cut which makes a difference. Personally, I`m glad this strain is finally loosing some of it`s appeal. Even with co2, it just vegges too slow. I`ve thrown misc green strains in the room and had some really impressive single plant yields...hey bushdoctor did you grow GDP or just knew a friend that did? what's the most you guy off one plant?