Hello, I have a 8 plant dwc hydroponic system, they are on the 7th week of flower. I'm using canna aqua nutrients a and b. is this a deficiency because I heard with canna nutes you need cal mag.
There def looks like some N toxicity(dark green foliage w/ single and triple blade leaves) but I think you had some ph troubles earlier on as well that lead to the rust look. Since your far enough along, I look forward to the next grow. I'd start the nutes out at 25% less than you did with this grow and make sure to check your ph everyday. 4th grow(Apprentice) - BC Big Bud 1200w
You nailed that one on the head, it's surely a Mag def rearing its ugly face. Add some Epsom salt, keep PH around 5.9 for optimal uptake. GL
Last two posters thank you so much!! I did have previous ph and nute problems at the beginning of grow. And thanks for the salt idea, looking forward to my next grow which will be a 18 plant one. Hopefully this new knowledge will let me hit the plants efficiently. Thank you do much guys! I would like your posts but I don't know how on my iPhone haha!
Try creating a new thread with more information on your grow like medium nutes lights temp humidity and so on and I'm sure alot more people will try to help you out man. Also add pics of the whole plant not just one leaf