Answer: Japanese maples seem especially susceptible to leaf scorch, so it's a common problem unless the plant is in a perfect environment. There are many causes - plants that are under stress from transplanting, drought, or heat stress can develop brown leaf margins and wilted,crispy-dry leaves. To help avoid problems, irrigate during dry periods, and wet the entire root zone, but do not overwater. Avoid injury to the roots and trunk. Compacted soil, reflected heat, and excessive salts from fertilizers, all contribute to maple leaf scorch.
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