Answer: It is common for newly planted trees and shrubs to go through an adjustment period while they are getting their roots established. The stress can show up as wilting, yellowing and dropping leaves, or even a few dead branches. Once the roots become established, the plants will perk up and produce healthy new growth. In the meantime, the best thing you can do is to water them deeply and regularly. If you haven't already, make a watering basin beneath each plant by mounding up some soil in a circle (about 12" diameter) around the main stem or trunk of each holly. Fill the basin with water, allow to drain, then fill a second time. Do this once a week during the rest of the summer and throughout the fall months. Watering this way will concentrate the moisture over the root mass and allow it to trickle down, wetting the entire root system. This should help the roots establish, which will be evident when new growth appears on your plants. Wait until next spring to do any pruning. At that time, prune out any dead limbs or branches.
Best wishes with your Japanese hollies!
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