The next day I had all the crunchy leaves. I did water them in the sunny part of their day, and I just gave them a good soaking but the water was left on the leaves when I was done. There is no cure for a virus, but as we say, this is the least likely cause. However, now they have brown curling edges and dead leaves. Usually with a virus you’ll also see yellowing of foliage not just the curling. Water deeply to flush these out of the soil around hydrangeas. This includes pre-emergent products as well as broad-leaf weed killers. Chlorosis is the result of too little iron being available to the plant. This is where the leaves turn yellow but the veins remain green. causing a type of leaf damage that looks like leaf scorch or sunburn. If the soil pH is too high, it can cause chlorosis. Hydrangeas are one of the many old-fashioned shrubs that are enjoying new found. Stop using weed killers on gardens and lawns. Low levels of iron in the soil can cause hydrangeas leaves to turn yellow. If an herbicide such as weed killer has been applied around the plant or on a lawn surrounding the plant this can cause what you’re seeing. Spray underneath of foliage with insecticidal soap if you see tiny insects on the underside of leaves. This damages the cells early in the life of the leaf so that as the leaves open they are distorted. Most common cause is a sucking insect such as aphids or lacebug feeding under the leaves when the foliage is young. In the fall, the dark green foliage develops hints of red. There are a few reasons that hydrangea leaves can curl like this – you can think about which one is more likely for your plant, but fungus isn’t one of them so you can stop using any fungicide. Hydrangea leaves: The ‘Masja’ hydrangea leaves are broadly ovate with slight serration on the edges.
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