I soaked it this morning to make sure. Is it best to do this daily?
If you have given it a really good soak then I would only do this about twice a week if there is no rain. Acers have very fine roots & they don't go that deep but if you water every day the roots will stay on the surface and make it more susceptible to drying out. A good soak which then tracks down will encourage the roots to follow deeper. It is a bit crowded out by the other shrubs nearby you may have to make some difficult decisions about which ones you are going to cut back if you want the Acer to have priority (or not).
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It is a bit crowded out by the other shrubs nearby you may have to make some difficult decisions about which ones you are going to cut back if you want the Acer to have priority (or not).