This is more for information than for finding a reason.

I have 8 different species. Some store bought beans, some from crosses. Sativa to indica with everything in between. All the plants get treated the same with ferts, watering, lighting, air, no predjudices on my part.

Well I have one species, (Strawberry Cough) that about 3 weeks into flower starts to canoe the upper sun leaves only. Not able to find a cause or cure. Does not seem to effect the end product at all.

Now, I would assume if it was the only species you had, you would be on here doing everything you could to find a cure. My whole point in this post is to say:
"Maybe a cure isn't needed."

We worry so much about this symptom and that symptom. Too much in fact. We should look at issues over a week or longer time frame. Look back a week if something is happening. What was the weather like, humidity, watering, ferts, repotting, got too dry, and any other assortment of the ills we come up with. Rarely (sure it does, but rarely) does a plant get sick overnight. If it does, you can probably look back at the last 24 hours for a reason.

And, then, there are times that shoot no matter what you do, this is just what the plant does. If you only have one species, you might not get to the point that you realize what is good for the whole garden has a weird effect on just one species and actually you are not doing anything wrong.

Going back to my Strawberry Cough, since it has no effect on the end result I don't worry about the canoeing, expect it in fact. If it does not occur, I might get concerned now, as that is what is usual for that species.

So many species are out there nowadays that no one really could be familiar with them all. You need to learn your garden and the species different/specific habits. Over and over and over again, the problems needing assistance relate to "Killing with Kindness."

I find that just repotting with good mixes on a regular basis, increasing pot size as you go, has the most beneficial effect on cannabis. One can even get awesome flower tops with just OF, water, good/proper lighting, and keeping the PH correct...through the entire life of the plant. You just have to add something? Molasses, unsulphered, and not too much of it either. Even on that regime the Strawberry Cough canoes....it must be deep in the DNA of this species.

Kinda got to rambling....pot does that to me. Later folks, I hope I helped someone.
WashougalWonder Reviewed by WashougalWonder on . Hopefully of interest This is more for information than for finding a reason. I have 8 different species. Some store bought beans, some from crosses. Sativa to indica with everything in between. All the plants get treated the same with ferts, watering, lighting, air, no predjudices on my part. Well I have one species, (Strawberry Cough) that about 3 weeks into flower starts to canoe the upper sun leaves only. Not able to find a cause or cure. Does not seem to effect the end product at all. Now, I Rating: 5