A friend suggested that the issue may be low humidity. The small leaves at the very tips of the plant were quite contorted, they curled inward as well. It may be hard to see because it hides on the underside of leaves. This creates blisters when the plant's cells literally overinflate or even burst. Overwatering the Plant There is no powdery mildew present. Why Are My Weed Leaves Curling: Causes & Solutions Ok, so there are a few different reasons why your cannabis plant leaves might be curling up, and they vary greatly. The bug feeds on leaves, stem terminals, flowers and seeds. She said there was some shinny stuff on the underside of the leaf which does not appear in the picture. Curling can also be caused by too much light, as the leaves will try to protect the plant by curling up. In conjunction with this, the newer leaves may be smaller than normal and may have brown edges. Seeing the leaves curling or clawing means that something is seriously wrong. There are several causes why marijuana leaves tend to curl up or down but do not worry because there are ways to cure them. Plant Disease - Why are my tall phlox turning brown and drying up before flowering? Leaves are turning yellow and brown, worse on the bottom. I’ll give a short explanation with pictures of each problem, plus links to the solutions! The leaves then turn brown, curl, dry out and drop. The only pest that is commonly seen is spider mite, which congregates on the underside of leaves, causing leaves to curl, dry up and fall off. They are not turning yellow or brown in the veins, but rather in between the veins. Why grow Phlox? The owner said the same thing happen last year and this year the phloxes came back health and strong and the same thing happen. In this article, we have listed several causes of why marijuana leaves tend to curl and how to cure them. Take a look. Curling could be due to over watering (in lower temps the plants likely won’t need as much water). Question: What do I do if the edges of my cannabis leaves are curling up? Nematode infections create problems when the worms feed on the leaves, roots, flowers or all three of the phlox… The plant may become stunted and die. The attached picture is of a diseased phlox leaf. Tall Phlox - Why are the leaves curling? Q. Let’s go over the 6 main causes of curled up weed leaves, and what you can do to remedy the problems. My tall garden phlox are diseased. The tips are deformed. The phlox bug overwinters in the egg stage in dead phlox stems. Sometimes known as “The Claw”. The leaves were rolling inward toward the vein so that the leaves resembled green beans. The following symptoms are for when your cannabis leaves are “clawing” or curling up or curling down. I have picked some and could mail them to you if you like. Only one of my 3 plants is having this issue. Fix this common (but hard to diagnose) marijuana problem today! 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