When should a japanese maple be pruned?
Never prune in spring, because maples bleed heavily then and lose a large volume of sap; late summer or full dormancy is the window. The trap is over-thinning — the layered branch habit is the entire value of the tree, so lion-tailing exposes thin bark to sun and triggers watersprout brooms that never look right, and a few small cuts each year beats one big cleanup.
Reading japanese maple before you cut
Verticillium wilt is the one that kills — a single limb or one whole side wilts and dies while the rest of the tree looks untouched, and peeling bark on a dying branch shows dark olive streaking in the sapwood. Leaf scorch is the one that does not: crispy brown leaf margins across the whole canopy in July and August from sun, wind, or dry soil, which is ugly but survivable, and the same goes for a late-April freeze browning the first flush, which it re-leafs from.
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