i would say top a plant when at least a 1foot tall and yes it should increase your yieldI'm not even sure if i want to top it...... Does it increase yield? I'll probably top this 1 and let my other 1 grow naturally, but is it ready to be topped?
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Aaahh forgot about cloning tops .I generally wait until it has 7 nodes and top at 5 so I can root the top of it.