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I personally have good consistent success vegging plants quite large before moving them to flower. 3-4' for a couple of strains I have is common for me. I do a bunch of pruning/topping in the process to remove foliage at the bottom and increase the number of branches at the top. One strain stretches to 6' + in flower..
Also use Advanced, 2 x 1K hps, 2 x 8 tube T-5 in flower, all mounted fairly high giving me 82" from the floor to the bottom of the lights. Maintain temps in the mid to upper 70s with the lights on... the results are unbelievable.. giving me 16-20 oz a month from 4 plants (I have room for 8 and harvest monthly) the buds are really tight and dense as well, which I attribute to Advanced stack, especially Connissieur (sp?). My biggest problem is having to use bamboo sticks to tie up my stuff that tends to fall over from the weight of the buds..
What are you doing with your nutes? I run about 2ml per liter on base and 1 ml per liter on additives. For example, 40 liter (approx 10 gal), I'll use 80 ml of both A and B, 40 of Sensizyme, 40 of Big Bud and 40 of Bud Candy.. I vary the strength through the cycle, but the ratio of base nutes to additives always is the same... I also flush every week as well.
Peace, Farmer Rich
My base nutraints increase every week. I use connoisseur A and B for my base. I start off at 3ml per L for week one and by the time I am ending flower I am up to 4.5 ml per L.
I also use a number of other during the same time as in. B-52, Big Bud, Bud Candy etc.
I just cannont seem to get rock hard buds. The are more spungy and fluffy. Every strain I have tried turns out the same way. I can see the lower buds not being rock hard due to the distance away from the light. However, the upper buds are getting plenty of light.