Oh man i love headband.
Hard to grow? Is it killing it?
Me too. Well I have only done one grow before this one and flowered clones with no veg time (bad idea) and hurt them pretty good using half strength fox farm big bloom with the directions on the bottle (nute chart is different).
This grow has been Red Diesel, K-train, and headband. All get the same nutes, and only the headband has done this. So I guess they are more sensitive than others. I love headband also, it is great smoke, but like trainwreck, is a low yielder. They are also re-vegged from the first clones so they have seen considerable stress, so anything that I see may not be typical.
Oh and it is not killing it, but slowly destroying all bud leaves on one branch with several colitas. I have a sister 3 weeks behind the one showing the problem. The younger sister has had 3-4 leaves do this and I hope i caught it soon enough. Although I did run about a gallon through each pot I did not do a real "flush". Run-off not totally clear. I think a full flush can be bad also, I hope I just broke up the salts that may be locking out. I think these things are also usually several problems manifesting themselves in one or more of the few ways she can talk. So this may or may not be the problem(s) I also suspect that I may have locked out manganese by excess magnesium. She had a couple of doses of epsom salts before using 1/4 strength Cal-Mag with every watering(I use RO water).