OK, thanks still trying to figure these sativas out. My Durban Poison was fine so fingers crossed.FWIW > with a 50 day veg I find my sativa's stretch about two feet.
To contain them, I install three bamboo stakes and a 20" diameter wire hoop at ~28" high.
When the plants grow past that I tie them down to the hoop and continue to train the tops to grow horizontally.
This is a Double Chocolate. Pretty sure I managed to maintain a canopy height of ~40".
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Cheers