The only time it has ever happened to me was after a stress period like a bad transplant or new clones.
I think curving leafs is a sign of PH problems. You might need PH down.ya its weird. some of the new leaf tips are curving left and right. also my stems dont always intersect evenly. I have one part where there is only one stem branch out
A friend of mine grew some kind of sativa that only had one point per leaf. I saw at least 3 plants like this. All appeared healthy and were flowering.
3 fan blades is lacking nutes or is not growing to its full potential, When you have more than 5, as I do.. 11 blades per fan.. Means its thriving. **also strain dependent as well**
Fan blades increase through the vegetative stage. Then they decrease through the flowering/reproductive stage. Indica have 5-9 fanblades in full mature veg, while sativa have as many as 13+ when in extremely mature veg. As plant progresses from veg to flower, the new growth will have a decreasing count of fan leaves. Fully mature flowering plant has 1 blade per fan leaf of new growth. As a plant re-vegetates, it will increase the blades per fan leaf again. After the plant reaches 5 blades per fan leaf again it may be ready for re-flowering.
I have an Indica with 11.![]()
Hybrid. Or possible. 5-9 was generally speaking.
(this information is in like 100 grow books.... no wonder borders closed)