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Lighter edges on top leaves

med_hierostarted grow question 4y ago

Why does my plant have lighter edges on top leaves? Is it light stress (i had a weak light very close), defieceny or something else?

med_hiero

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Leaves. Color - Yellow

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Organomananswered grow question 4y ago

I believe this is the first sign of burning from feeding with a cannabis incompatible fertilizer with a strength of 18/18/18, which is waaay too strong in every macro nutrient. For veg you want fertilizers (roughly) around 5/2/5 and for flowering (roughly) around 4/4/6.

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GreenOrganicGermanyanswered grow question 4y ago

Your plant is lacking magnesium! Add some calmag to your nutrient solution and it will get better. I had this problem often because we have very "soft" tap water in my area. It's also a common issue with reverse osmosis water.

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