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I can't see much on the leaves. It does look like they are in the flower stage now, but not too certain. Any white growth?
Here's a link to plant deficiencies. Hope it helps with whatever you are seeing...
Marijuana Plant Nutrient Deficiency & Excess Diagram
My first guess would be a nutrient deficiency. Have you begun a fertilization regimen? It is early, so there is time to react. I'm not great at determining which nutrient or mineral is missing. The big ones are Nitrogen, Phosphorous and Potassium. Add ferts soon in small amounts at first. I try to water every 4th day alternating between nutrients and no nutrients.
I must say that your plants look great! There, I said it again!! They don't appear to be flowering yet though. What is your photoperiod?
Also, Hydrotech on Kingston Rd at Midland.
Nitrogen. From the deficiency chart I posted the link, the nitrogen symptoms match your plant from what I can see in your photos.
1) Lower leaves turn yellow
3) Yellowing progresses upwards
4) Leaves continue to curl and discolour
5) Leaves start to drop
I appreciate your help man, means a lot
Sorry KC, had my peeps mixed up lol. Also don't discount Highway Hydroponics in PP. Also excellent people. I'm REAL close lol.Yes, Durham. I'm a driver and a nine iron from the Nuke plant in Pickering! I don't know where WCJ11 is located though.
100% Nitrogen. See how REALLY deep green the top leaves are as well. Add that as #6 on that list of classic symptoms. Not toxicity, just too much over a prolonged period.Nutrient deficiencies??