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Reasons for Dry, Withered Leaves on Four-Season Osmanthus and How to Fix Them

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Sometimes we notice that the leaves of a four-season osmanthus (Osmanthus fragrans) have dried out. The main causes of this are unsuitable environment, lack of nutrients, pest infestation, and leaf aging. Once we identify the cause, we can treat it accordingly: water it when it is dry, supplement it when it lacks nutrients, and use insecticide when pests are present.

1. Environment

We know that if the weather is fairly dry, it is very likely to cause its water to flow away rather quickly, and the water the trunk supplies to the leaves will be affected. When this happens, the tips and edges will show symptoms of drying out, and at this point replenishing water is very important.

If the sun rarely comes out and there is a lot of rain, its newly grown branches are very likely to be tender and brittle, and to hold more water. If strong sun suddenly appears, it is very likely to dry out the tips of its leaves, and if the situation is fairly serious, all of its leaves may dry up. So at this point we should still place it in a shaded spot, and after a day or two it will recover on its own.

2. Nutrients

If it lacks nutrients, its leaves may become fairly dry; for example, if its roots do not get enough oxygen or potassium, its growth will also be affected. What we need to do at this point is apply a compound fertilizer, and also prune it to some extent. This is because doing so can balance its nutrients somewhat and allow many cells to receive light. It can both save the withered leaves and make its tree shape more attractive.

Of course, if our potting soil is fairly fine, it may lack humus. This will affect respiration, and the leaf edges will also dry out easily. So we need to replenish it in time.

3. Pests

Pests can also cause its leaves to dry out, so we should still use an insecticide to resolve this symptom. And the earlier it is discovered and dealt with, the better, because if it goes on too long it is fairly difficult to fix and may cause it to die.

4. Aging

If the tree is fairly old, this can also very likely cause its leaves to dry up. Because although this tree is evergreen, it still needs metabolism, so leaves from the previous year are very likely to wither, since their chlorophyll cells have long been old. Moreover, the old leaves are located on the lower parts, so they get worn, and therefore drying out is also normal.

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