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Hi man I think it’s a to short of magnesium. I also had the same problem with my plants. Now I’m using Calmag to prevent more yellow coloring and make them healthy again. Good luck

hey there growmie, sorry to disagree with everyone here, but it's clearly magnesium deficiency you can tell from the yellowing of the edges and in between the veins. You definitely need to add cal mag urgently otherwise your plants will get worse. Add the cal mag in the feed and make a 1-3ml/L cal mag spray and spray twice a week for ten days , the problem will stop spreading immediately and the plant will recover within two weeks. Hope this helps ! 🚀

Bonjour mon ami Je dirais que ta plante présente une légère carence en azote. Voici quelques explications... Nitrogen deficiency is probably the most common deficiency observed by cannabis growers. It is usually easy to identify and correct as soon as it becomes visible, although it bears a basic resemblance to several other early-stage deficiencies. In the early stages of nitrogen deficiency, the leaves seem too light, almost yellowish, compared to the deep green of healthy leaves. In addition, leaves with nitrogen deficiency usually have slightly darker veins than the very light color of the leaf tissue, although the contrast is not as marked as in other deficiencies. Conversely, the toxicity of nitrogen results in a very dark green hue, almost black in extreme cases, on the leaves.🤐 In severe cases of nitrogen deficiency, the leaves appear lighter and less colorful, and do not end up drying and dying. The large leaves on the lower and outer parts of the plant are usually the first to be affected and the first to die.🤐 If the nitrogen deficiency becomes visible in the later stages of flowering, it is not necessary to correct it; in fact, it is natural that the oldest leaves fall and die at this stage because they have become useless. However, nitrogen deficiency during the vegetative growth phase or at the beginning of flowering can severely affect overall yield and quality, as it affects the plant's ability to photosynthesize energy. To correct a nitrogen deficiency, it is usually sufficient to increase the concentration of your normal NPK fertilizers, but if adjustment is necessary, you can easily find 100% nitrogen additives.👍 Good luck for your grow 🌱 May the force be with you 💪