Burnt marijuana leaves

A question from a fellow grower:

What’s happen with this plant? His leafs going “yellows”.Is that normal ?

looks like nutrient burn

If the leaves are yellow then he needs nitrogen but be careful, you can either get the Nitrogen booster or the fertilizer. Just add a little at a time

When the leaves are fading and becoming yellow that could indicate too little nitrogen. But burnt looking tips is usually a sign of too much nutrients or an imbalance of nutrients or PH that is causing nutrient lock out. Looking at the picture it looks like nutrient burn from over feeding or nutrient salt build up. Back off on nutrient concentration and increase your watering with plain water. If it is very severe you can flush the soil with water, r/o or distilled water being best for flushing but tap water will work too.

Here’s a link with some good info to start and check out others written here as well that may help answer your question. Nutrient Deficiencies In Marijuana Plants: The Ultimate Guide

Of course read the free bible available as well for more info.