Brown rust spots on oldest leaves

Okay, rust spots and curling leaves on the lower part of your cannabis plant could be a sign of a few things. It might be a nutrient deficiency, like magnesium or calcium. Those older leaves need those nutrients to stay healthy. It could also be a pH problem, making it hard for the plant to absorb what it needs. Or, and this is less likely, it could be a fungal disease. To figure out what's going on, you might want to check the pH of your water and soil. You could also try giving your plant a balanced nutrient solution to see if that helps. If the problem gets worse, then you might be dealing with a disease. let's dig a little deeper into those rust spots and curling leaves. Nutrient deficiencies usually show up on older leaves first because the plant pulls nutrients from them to support new growth. Magnesium deficiency often causes yellowing between the veins of the leaves, while calcium deficiency can lead to brown spots and stunted growth. pH imbalances can lock out nutrients, even if they're present in the soil. Cannabis prefers a slightly acidic pH, usually between 6.0 and 7.0. If the pH is too high or low, the plant can't absorb certain nutrients, leading to deficiencies. If you've ruled out nutrient problems and pH issues, then you might be dealing with a fungal disease like Septoria leaf spot. This usually starts with small, round, yellow spots that eventually turn brown and develop a dark border. Good airflow and avoiding overwatering can help prevent fungal problems.

Hey there it’s a simple easy fix your just over watering you plant causing root problems. If you let your soil get completely dry between watering it may seem like a long time between watering sometimes but I assure you a plant that size when you water the pot completely then it’s possible sometimes to have to wait around 2 weeks b4 needing to water again If you wait a few days without water you will see plant start to thrive again for a few days then when dirt is getting really dry and you see top layer has changed colors and you can see it’s dry At this time you will start to see your plant show the slightest signs of wilt like the leaves will not perk up as much durring the afternoon At this time when you see the slightest signs of wilt from lack of water this is the time you water to water the plant When you get around to watering next time I would also collect some the run off water out the bottom of the pot and check the ph of the run off water just to make sure the soil ph is any problems Good luck Your doing a great job practice makes per

Hey growmie, after looking closer, yeah, those lower leaves are darker than they should be, and that might mean a bit too much nitrogen on top of a calcium issue. The rust spots and curling still scream calcium deficiency (especially with soft water), but when the leaves go deep green and leathery like that, it's often excess N locking out other stuff, especially calcium and magnesium. So now the plan shifts a bit: Ease up a little on your nitrogen-heavy feed (less grow formula or N-rich additives) Add CalMag around 1–1.5 ml/L Keep pH in the 6.3–6.5 range Watch the new growth — that’s your sign if things are back on track It’s not a disaster or anything, but a slight course correction now saves you from chasing deficiencies later in flower. See you around growmie 🤞🍀♥️