Could I prune dead tips off Japanese Maple (Acer Palmatum) now?
You can prune dead & broken branches at any time. When you prune, prune back to living wood just above a bud or just outside the collar where a branch meets a stem. Do not leave a stub of dead wood. This can become an entry point for disease or insects as it will not heal. Only living wood will produce callus wood to heal over the wound. Do not use tree heal sprays. They interfer with the tree’s natural healing process and can, in some cases, cause problems. http://www.urbanext.uiuc.