Maple roots, especially the valuable little ones, are sensitive to being over-watered and can die from it. In that type of situation a maple will … For the last two years the tree’s leaves have started curling and burning up in early June. There are certain bugs and pests which are known to cause the curling of cannabis leaves. What is odd as that only certain branches are doing this. It happened to a laceleaf Japanese maple I planted a few years ago, it leafed out then the leaves started curling and drying, falling off, and whole branches dying. For 20 years we’ve had a Japanese maple in perfect health. This year, we noted some of the leaves were curling up and drying out. I recently uprooted it and out it in a nice open area. i had a Japanese maple tree that was in a bad area, other trees were around it and it hindered its growth. Leaves on the same branch often show similar symptoms but an entire tree may not be uniformly affected. Needless to say, the poor thing is toast - and I feel especially bad about it because the tree was a gift. Its characteristics are flat, circular seeds, large pointed leaves and sap-filled shoots and leaves. Not really getting brown, just curling up and looking like popcorn. Debbie’s maple trees are dropping leaves as a sign of shock. I have been watering regularly. Entire leaves may curl and wither when leaf scorch is severe. Since then, it has slowly but steadily lost all its leaves by curling, drying up and falling off. This Spring considerable dead branches had to be cut back. Due to the root, plant structural, and photosynthesis issues which many pests can cause, depending in the pest and severity of the infestation, it can cause curled up leaves. The other cause of curling leaves could be bugs and pests. Curling could be due to over watering (in lower temps the plants likely won’t need as much water). Other signs of a tree in shock include: Leaf scorch; Brown leaf tips; Premature fall color; Stunted twig or flower growth; Late spring budding; Branch dieback I have a Japanese maple that we planted two years ago and never had a problem. Not one single leaf has grown over the past 5 months. Curling can also be caused by too much light, as the leaves will try to protect the plant by curling up. Following that initial drowning the tree will have a reduced root mass to send up water, oxygen, and nutrients to the leaves. The Crimson King maple is a cultivated variety of the Norway maple tree. This could explain the indoor plants curling – try moving the light further away. It is a tall tree and offers a large amount of shade. Leaves Dropping After Transplant and Other Signs of Shock. But transplant shock can look much different for your tree. 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