Weird looking leaves

The symptoms in the image — uneven leaf discoloration along the edges and slight curling — suggest a possible pest infestation (e.g., thrips or spider mites) or an early-stage nutrient issue. Most likely causes: 🐛 1. Thrips or Spider Mites * Symptoms: Small silver or pale spots, irregular discoloration, a "rough" texture on leaves, sometimes tiny black dots (excrement). * Check for: Look at the undersides of leaves with a magnifying glass for tiny moving insects. * Treatment: Neem oil, predatory mites, insecticidal soap, or pyrethrin (make sure it degrades before harvest). --- 🌱 2. Calcium Deficiency * Symptoms: Irregular yellowish-brown spots, especially on newer leaves, often with deformed growth. * Causes: Very soft water, incorrect pH, poor nutrient uptake by roots. * Solution: * Check and adjust pH levels (optimal: soil 6.2–6.5, hydro 5.8–6.2). * Supplement with Calcium/Magnesium (CalMag) if needed. --- 🌡️ 3. Environmental Stress * Symptoms: Leaf deformities can also be caused by high temperatures, strong air circulation, or light stress. * Solution: Keep temperature stable around 22–26 °C (71–79 °F), and avoid direct airflow on the plants. --- ✅ Recommendation: 1. Thoroughly inspect the plant for pests. 2. Measure the pH of your water and substrate. 3. Review your feeding schedule (are you using CalMag?). 4. Make sure temperature and humidity are within optimal ranges. I hope this is helpful! 😘

Extremely bizarre that it has occured multiple times across different genetics, but it is not from cold temps, dry air, heat, humidity, rapid temperature changes, sudden changes in moisture levels or proteins folding.........most likely from damage caused to embryonic leaves through rough handling when applying LST. Either way, it is only the odd leaf and if it is not affecting anything............

That's interesting. What would cause that, precisely half right down the midrib? I'd guess it to be developmental, but how could it show up across different genetics unless it was environmentally applied.......? hmmm Dry air can cause the leaf cells to dry out unevenly, leading to splitting and shrinking on one side as the leaf tries to adjust to the moisture imbalance. Sudden changes in moisture levels, whether from underwatering or overwatering, can stress the leaf, causing it to split and potentially shrink on one side as it struggles to regulate water content. Rapid changes in temperature can also cause the leaf to expand and contract unevenly, leading to splits and distortions. Heat stress causes proteins to unfold and lose their native three-dimensional structure, a process called denaturation. Heat can also disrupt the structure and integrity of cell membranes, which are primarily composed of lipids. Even though now the affected leaves are big and robust, at some point, they were tiny blips on a stem, microscopic little expressions, at some point in the leaf's early developmental life, there was abiotic stress in the form of humidity or high temperatures that caused folding of proteins (Breeaking down), Not long enough to damage visible fully grown parts of the plant but the tiny developing parts that have yet to fully grow, once environment settles back down attempts to stabilize the weakened enzymes, this is where leaf distortions become permanent if thee damage cannot be reversed. Often, the damage just isn't visible until the damaged leaf fingers develop further. Not even necessarily heat, it could be rapid temperature change, having a second look, I notice how cold everything is in your tent, coldish days and cold nights. Photosynthesis is temperature-dependent. Cellular respiration is strongly dependent on temperature, ain't much of that happening at 66F, save that for ripening. Gluck.