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OR... do some testing for a high EC ! The dark leaf color with purple petioles is a good indicator of ...
Nutrient Burn – Symptoms
Early signs of nutrient burn may not be obvious to inexperienced growers. First, the leaves of your plants will turn deep green except for the tips, which will appear bright yellow. The tips of the leaves of your marijuana plants will also curl up. As nutrient burn continues to develop in weed plants, the yellowed, curling leaves will begin to die and your buds will begin to turn yellow or brown.
False Positives – Similar Problems
There are several issues that may look like symptoms of marijuana nutrient burn but are actually indicative of a different problem. For example, light stress can cause leaves to begin to turn yellow at the tips. However, this will occur only on specific parts of the plant, while nutrient burn happens everywhere in the plant. Potassium deficiency and pH fluctuations can also cause leaves to turn yellow or brown, but with this issue, you won’t see your weed plant leaves curling up.
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