Unfortunately, pests are perhaps the hardest condition to correct, so it’s best to avoid try and avoid them all together. Though you can often see the infestation, this is not always the case – a tell-tail sign (aside from the remnants of the buffet) is a plant that lacks vigor in addition to other symptoms associated with things like overwatering or poor air circulation. If your yellow leaves come with spots or bite marks, they’re probably infested with pests. ![]() We also recommend growing plants off a cold cement or tile floor use a milk crate or stool to raise them off the ground when necessary. These oddities are most common in leaves toward the top of the plant and can easily be remedied with a fan (if too hot) or root insulation (if too cold). Temperatures outside of the ideal range of 70 to 80 degrees Fahrenheit also risk discoloration and curl leaves. The best way to correct light burn is to move you plant away from your light source, usually between eight and 20 inches depending on the watt and lighting type. Use magnesium supplements to correct this issue Magnesium deficiency, characterized by a yellowing around the leave’s green veins, is most commonly caused by an improper pH balance. If the yellowing is caused by excessive nutrients, flush the root system with pure water then add a half-dose of your fertilizer instead. If the problem is caused by a deficiency, slowly increase the concentration of your cannabis-specific fertilizer until new growth appears. The most common nutrient deficiency in cannabis is nitrogen, though note that excessive nitrogen can also cause yellowing (plus curled, claw-like leaves). ![]() If the yellowing occurs primarily at the base of the plant, the issue is likely a nutrient deficiency. Poor drainage can also contribute to overwatering so always grow your cannabis in pots with drain holes. Plants that are over-watered will have leaves that seem swollen and droopy while under-watered plants (though much less common) will be thin and frail. The most common cause of yellow leaves is either over- or under-watering. Watering ProblemsĪfter measuring and adjusting pH, take a look at your watering schedule. ![]() That’s because an improper pH balance – whether too high or too low – can actually block nutrient absorption. The first thing you should do when cannabis leaves start to turn yellow is to measure the pH of your grow medium (soil, water, rice hulls, expanded clay, etc.). It is up to you to determine what that is so you can treat the problem without making it worse. If your marijuana leaves are turning yellow, don’t panic! This is just your plants’ way of telling you something is wrong. Diagnosing and Curing Yellow Cannabis Leaves
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