Hammerhead is great grower, I am only saying that Haze or any plant with strong NLD influence will need different approach flowering it properly and you should only judge it if you flower it right.Easy until later flowering hit. They were tall dense bushes. I had to prune often and still couldn't keep them tame. The short phenos of Madmacs THH. These were almost 7' I had another that was 9' tall. Not suitable for indoor growing without major training pruning.
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This is example of what I meant, these THH plants had the wrong feeding regime, they never start budding properly, what you see is a result of Nitrogen excess, possibly other factors. 11/12 would help a lot too. Those dark green leafs and leafy foxtails tell the story.
Good question, there are indicators that plant is finishing its life cycle right? Glandular heads are changing color, pistils are shivering and drying, leafs are using up their nutrients, plant is drinking less and less water. But of course more often than not, you cannot reach full potential indoors, its artificial environment. Some NLD never stop flowering too, so you need to choose when to harvest based on other aspects.how you know they reached the full potential ?
The soil and sun is where you might get better result, however in nature, there are other conditions that might not allow the plant to reach its full potential too. So its about getting as close as possible.
Anyway, if you manage to flower it properly, you will know. These plants will reward you and you dont need to find 5% to be happy with it. Many female will be much better smoke than what the market usually offers, making the grow worthwhile.