What To Do If Your Cannabis Plants Have Yellow Leaves

What To Do If Your Cannabis Plants Have Yellow Leaves
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Chlorosis is a problem that all gardeners have to face at some point, and that includes cannabis growers. The term designates a lack of chlorophyll and usually results in leaves turning from a succulent green to a lame yellow. Fear not, however, because the issue can usually be resolved once the cause of the discolouration has been identified. Here are a few common causes of yellow leaves in marijuana plants. Related Post Common Cannabis Growing Mistakes – And How To Fix Them Nutrient Lockout Most people assume that yellow marijuana leaves signal a lack of nutrients in cannabis plants, and they’re often spot on. However, in the majority of cases, the problem isn’t underfeeding but nutrient lockout, whereby environmental conditions prevent plants’ roots from being able to absorb the minerals in the growing medium. Most commonly, this occurs when the soil pH slips out of the optimum range. As a general rule, soil should be maintained at a pH of 6.0 to 7.0, while hydroponic systems need to remain at pH 5.5 to 6.5. Large fluctuations in acidity can reduce the bioavailability of nutrients like nitrogen, which means that no matter how much feed you add, your plants simply aren’t going to develop that verdant glow. Luckily, all this can be avoided relatively easily using a simple pH meter and a bottle of “pH Up” or “pH Down” solution to measure ph level. Nutrient Deficiency Sometimes, yellow leaves really are a sign of nutrient deficiency. A lack of nitrogen in the soil, for instance, tends to cause leaves to begin yellowing around the edges before the chlorosis spreads to the centre. Nitrogen deficiency is a common reason for yellow marijuana leaves. Brown spots are a good indication of a potassium deficiency. As well as lack of calcium. Insufficient iron or…

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