I've noticed that some strains seem especially prone to the canoeing effect you describe. It seems to me to be a heat and/or light issue where the only leaves effected are always the leaves closest to the lights. As you've said, if it's just a few leaves, then I often will just let the plant be instead of moving the lights further away. Even when the leaves are canoing, the buds are still fattening up so I figure things are okay. Canoed leaves do tend to get beat up over time though, at a faster rate then other leaves. I'd still rather have a few more stressed leaves at the top, but get more light to the rest of the plant, so I keep the lights as close as possible. When I was growing White Rhino, I had quite a few issues with the leaves reacting to heat, nutrients, and/or too much light. When I grew something with Afghan genetics, I could do almost anything to it as far as nutrients and lights and it pretty much took everything in stride.
growweedeasy Reviewed by growweedeasy 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