HEAT/COLD DAMAGE AND SIGNS

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Hi, so I have 3 fans to ensure good air circulation in the tent, that helps a lot, then of course the inline fan that can pull the heat out of the tent. Under the pots, I have a heat blanket for the cold, which you can order from almost any grow shop. And then in summer, when it gets really hot, I also have a small air conditioner that helps with extreme heat. That's how I handle it, but you can manage almost everything with a good inline fan and regular fans. What’s also interesting is if your lights are dimmable, set them just as high as necessary so they don't get too warm.

Hey Growmie, When it comes to heat damage, look for wilting, leaf curling (especially upwards), dry or crispy edges, light green or yellowing tops, and stunted growth. In more severe cases, leaves might look almost “burnt.” To deal with it, increase airflow with a fan, raise your grow lights if they're too close, and make sure temps stay in the 70–80°F (21–27°C) range. You can also lightly mist the air around the plant (not directly on it if it's under lights), and consider running your light cycle during cooler parts of the day. With cold damage, signs include drooping leaves, slow or stalled growth, dark purple or blue tints on stems or leaves (not from genetics), and leaves that feel soft or soggy. If seedlings get too cold, their roots struggle to function, which can cause a wet/dry cycle imbalance. To fix it, raise temps to at least 70°F, especially at night. Use a heating mat if needed (especially for the root zone), and avoid overwatering, cold roots, plus too much water is a bad combo. In both cases, give the plant time to bounce back once conditions are corrected. Early seedlings are surprisingly resilient if you catch stress signs fast and adjust your environment accordingly.

Control the climate better. Stop whatever is causing the damage - that's all you can do. No "first aid" kit to buy, lol.

ive never really noticed any damage from the cold but slow growth. heat damage will give plants crispy leaves and necrotic spots woth twisting and curling closest to the light normally.

What type of damage? Medium play a large role into temperature tolerance, as does humidity, varietal, and so on.

So I actually recently has some heat stress with my grow room getting over 100 degrees F, the leaves drooped a bit, the lowers were a lighter shade of green than the tops and there was some rippling in the leaves. If you don’t have the means to buy a cooling system for the set up you have, you may want to put your set up in a new cooler location if possible, of freeze wet rags flat in a freezer and then put them one as a time hanging by 2 corners behind a fan- just watch your humidity if you go about that method.