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Most hydrangea arborescens like slightly acidic soil that is nutrient rich. Make sure to plant these in an area that is well drained to prevent root rot. However, the soil does need to be moist. This type of hydrangea does not do well in extended periods without rain. So be sure to water frequently, especially mid-summer. These shrubs can handle full sun depending on the variety. However, most varieties prefer to have some relief from the sun mid to late afternoon. If the shrub is in full-sun, be sure to carefully watch the leaves for droopiness, which typically means it needs more water.
According to the Missouri Botanical Garden website, these plants have no serious insect or disease problems. Many species of hydrangea, including this one, are susceptible to bud blight, bacterial wilt, leaf spots, mold, rust and powdery mildew. Watch for aphids, mites, scale and nematodes.
Pruning Smooth Hydrangeas
These shrubs bloom on new wood. So it is best to prune back close to the ground in late winter. If you do not prune then, you can also prune in early spring to encourage new growth. You should remove sick and dead branches that are damaged in the winter regardless.
If you do prune back to the ground in the winter, it goes a long way to help promote stem vigor. Check our our hydrangea pruning guide for more information.
