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What causes cannabis leaves to get dry or crispy?
There are many reasons that the leaves of your marijuana plant can get dry or crispy. Sometimes crispy leaves can be normal, but most of the time, this means that something is wrong with your cannabis plant.
Usually the bottom-most leaves start to get a little crispy or yellow as they start getting old. If your dryness problem is just affecting the oldest leaves that don't get much light anymore, you shouldn't worry.
If the leaves affected are the ones which are closest to your lights, it's possible that the crispiness is a result of 'light burn' or 'heat burn'. You can tell if this is the cause because the only cannabis leaves affected are the ones closest to the lights or source of heat.
If the dryness affecting leaves that are new growth, it's possible that you are you are giving your cannabis too many nutrients and it's showing the first signs of nutrient burn. Usually the first signs of cannabis nutrient burn are yellow or brown tips on leaves, and the problem spreads up the leaf. If you accidentally spill full-strength nutrient filled water on some of your leaves and don't wipe it off, it's possible that they will get burned from this as well, either from the nutrients or the lights being magnified by the water.
The last reason your cannabis may get crispy or dry leaves is due to some sort of nutrient deficiency. The best way to prevent nutrient deficiencies is to make sure your giving your plants the right type of nutrients and pHing the water to the proper level depending on your growth medium. If you don't know what type of nutrients to get, I recommend using Fox Farms Soil Nutrient Trio for your soil grow and Fox Farm Hydroponic Nutrient Trio with your hydroponic grow (including if you're growing in coco coir, perlite, rockwool, or other soilless growing mediums). I have personally have good experience with both of those products.
If you've done all that and still are having problems, then check out this page which explains the symptoms of nutrient deficiencies in marijuana.
If you have anything to add, or if you have any other questions, I'd love to hear from your regarding your experiences growing weed!