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Acer palmatum
Growing calendar
Typical timing for central Japan (Kanto region). Shift it for your own climate, and record your actual dates.
Guides
- Planting a Japanese Maple: Choosing a Spot That Will Not Scorch It
- When to Prune a Japanese Maple Without Making It Bleed
- Japanese Maple Care: Water, Mulch, Feeding and Growing One in a Pot
- Japanese Maple Through the Year: What to Do Each Season
- Japanese Maple Problems: Brown Leaf Edges, Wilt, Aphids and Dieback
- Propagating Japanese Maple from Seed, Cuttings and Layering
Common problems
Start from what you can see on the plant.
Pests and diseases (4)
Problems recorded for this plant, most serious first.
Aphids
MajorPest
Small green or black insects cluster on shoot tips and leaf undersides, crinkling the leaves and stopping growth. The honeydew they excrete supports sooty mold that blackens the foliage.
Nettle Caterpillars
MajorPest
From summer into autumn they cluster on leaf undersides and graze the tissue so the leaves turn translucent white. Larger larvae riddle the leaves with holes and strip the branches bare.
Longhorn Beetles
MajorPest
Sawdust-like frass is pushed out at the trunk base or branch crotches. The wood is hollowed out, the tree loses vigor, and the trunk may snap in strong wind.
Powdery Mildew
CommonDisease
White patches appear scattered on the upper leaf surface at first, then the whole leaf is coated in a white powder. Leaves later yellow, brown and die back, and reduced photosynthesis cuts growth and yield.
