Overwatering (especially when combined with heat) can also cause leaves to curl up. This plant was grown in muddy soil, and the curling, unhealthy leaves kept getting worse and worse over time! Underwatering causes symptoms that often look like overwatering, but you’ll know it’s underwatering if the plants perk up each time after you water them.
Although often caused by overwatering, once the roots are sick you’ll see symptoms for a little while even after you start watering your plants properly. Unhealthy roots can cause all sorts of problems including curling and clawing! This plant’s roots were damaged from being overwatered and too hot for several days. As a result, the leaves took on a strange, blistery appearance. This plant suffered from heat combined with overwatering for several days. This damaged the roots and gave it this odd leaf curling. Root rot is something marijuana hydroponic growers can suffer from if pathogens attack the roots. It is often triggered by heat and/or lack of bubbles near the roots.
Root rot can cause curling leaves and brown patches as well as sometimes other nutrient deficiencies. If a plant stays in the same container for too long, the roots will eventually start wrapping around the edges of the pot. This is known as being “rootbound” and causes symptoms similar to other root problems. A rootbound plant has been in the same container for too long. Rootbound plants often droop, appear yellow, get nutrient deficiencies, and stay small. If you see tons of white roots when transplanted, that means the plant was in that container too long. When this happens, the main solution is to transplant the plant into a bigger container. Another solution is to grow in fabric pots or air pots. These types of pots let air in from the sides, killing the circling roots (“air-pruning” them) and prevents the plant from getting rootbound for months. To help a rootbound plant, transplant to a bigger container with fresh potting mix. Or start with air pots or fabric pots in order to prevent plants from getting rootbound at all. If plants are experiencing a lot of heat, it can make leaves droop and/or curl. Some strains can handle a lot of heat, while other strains tend to droop when it gets warm. Plants can get light burn (sort of like a sunburn) even if the temperature is completely under control. The symptoms are usually concentrated close to the grow lights. Sometimes this can cause leaves to claw and curl downwards. Light burn can cause the leaves closest to the light to turn yellow. Often a bug infestation caused general plant unhappiness, but these are some of the most likely to cause curling or clawing leaves. Usually, you can’t see broad mites because they live inside the plant. The main symptom of an infestation is strange leaf curling that is specific to this pest, as well as “wet” looking leaves. Hemp russet mites can also cause drooping and other strange symptoms, but the bugs are so small many growers don’t realize what they’re dealing with. Hemp russet mites cause drooping and yellow mold-like growth on the tops of plants. Fungus gnats look like tiny flies buzzing around your topsoil. Although a few fungus gnats won’t really hurt your plants, a big infestation can damage the roots, causing symptoms similar to other types of root problems. Curling Potted Plants – What To Do About Curled Houseplant Leaves. Are your houseplant leaves curling and you don’t know why? Curled leaves on indoor plants can be caused by a variety of issues, so it is important to understand the various causes so that you can take effective action. Let’s take a look at the main causes and solutions for curled houseplant leaves.
There are a number of reasons your houseplants may be curling and can include any of the following: Pests. Sucking insects, such as aphids, can distort leaves and cause leaf curling. Aphids are soft bodied insects that are normally found on the undersides of leaves and at the growing tips of the plant.
If there is a severe infestation, you can cut off those areas of the plant. Thrips and whiteflies are also other insects that can cause curled houseplant leaves. When your potting soil stays soggy for too long, this can also cause curled leaves, as well as lead to root rot.