Umm, at this point you may be ready to harvest. Do you have a bud scope? You could use a jewelers 10x loup or other good magnifying device that shows the trichomes. Looking for mostly white trichs with a few amber ones in the field of view.
Otherwise I would say you have a nutrient...
Hey WCJ, good on you for getting some nutes. And I'm thrilled to hear your girls are in flower. Your timing is perfect!
I'm off to HydroTech to see Brad tomorrow. I need to flush soon and want to discuss SledgeHammer vs. ClearEx.
Lastly, I've been smoking a bit of the NL product. It seems...
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
Amazon.ca has all the Fox Farm ferts. That's where I shop. Homegrown Hydroponics can be found throughout Ontario for the in-store experience. They are usually knowledgeable and can help with anything. There's also Holland Industry in Toronto. They have an online service too and are very...
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...