Japanese maple: crisp brown edges around the leaf margin

What it is likely to be on japanese maple

1. Leaf scorch

   Candidate 1very common on this plant

   ·source

   Sourced guidancehigh confidence

   • Royal Horticultural Society: Japanese maples — cultivation
   • Plant Finder — Missouri Botanical Garden: Acer palmatum — problems

   Checked 2026-08-13

   Dry, brown, brittle patches or margins where tissue has died, typically on the side facing the light and on the most exposed leaves. Unlike a disease it does not spread, and unlike drought it affects the exposed leaves rather than the whole plant.

   Points towards it

   • · scorch dries the leaf from its thin edges inward, leaving a crisp brown rim on a leaf that is otherwise green
   • · it follows hot dry wind rather than anything done to the tree, and appears within days of it
   • · the windward and sunniest side of the canopy burns while the sheltered side stays perfect
   • · it is caused by exposure in the open garden

   Argues against it

   • · discrete spots or a surface coating are a disease rather than tissue dried by wind and sun — this rules it out entirely.
   • · a maple in permanently wet ground browns because its roots are failing, which needs the opposite response to watering more

   Check this next

   Look at which side of the tree is affected and where on the leaf the brown is. Scorch takes the exposed side of the canopy and the finely cut cultivars worst, drying the leaf margins to a crisp brown rim while the centre and the veins stay green — and the leaves in the middle of the plant, shaded by the others, are usually untouched. Even browning across the whole tree points at the roots instead.

   What to do now

   Water deeply in dry spells and mulch generously, but treat the position as the real answer: japanese maples want shelter from wind and from hot afternoon sun, and the dissected forms want it most. Move a container-grown tree; for one in the ground, plant something to windward rather than resign yourself to it. Do not cut the scorched leaves off — they are still working, and the tree will look normal again next spring.

   ·source

   Sourced guidancehigh confidence

   • Royal Horticultural Society: Japanese maples — cultivation

   Checked 2026-08-13

2. Draught stress

   Candidate 2very common on this plant

   ·source

   Sourced guidancehigh confidence

   • Royal Horticultural Society: Trees — establishment and watering
   • Plant Finder — Missouri Botanical Garden: Watering newly planted trees

   Checked 2026-08-13

   Damage from moving air rather than from cold alone: a houseplant beside a door, an opening window or above a radiator loses water faster than it can replace it, and drops leaves or browns at the edges. The tell is that the damage is worse on the side facing the draught.

   Points towards it

   • · the tree was planted within the last two or three seasons, or the weather turned — and a young tree has no reserve for either
   • · the leaf edges crisp first, because they are furthest from the water supply
   • · the rootball itself is dry, which is not the same as the bed being dry

   Argues against it

   • · browning confined to the exposed side is wind or sun scorch, which is a different answer with a different fix

   Check this next

   Push a finger or a trowel into the ROOTBALL itself, right against the stem, rather than into the bed beside it. A newly planted tree can be bone dry in the original rootball while the surrounding soil is damp, and testing the wrong place is why this is so often missed.

   What to do now

   Soak the rootball slowly with several full cans rather than sprinkling the surface, and mulch a wide circle afterwards while keeping the mulch off the bark. Expect to do this through every dry spell for the first two or three summers — that, rather than feeding, is what establishes a tree.

   ·source

   Horticultural consensusmoderate confidence

   No external citation — see the evidence type above.

   Checked 2026-08-13

Narrow it down

This page lists everything at once, which is the right shape for reading and the wrong shape for deciding. The interactive tool asks one question at a time, starting with whichever would separate these causes fastest, and stops as soon as further answers would not help.

Opens with the plant and the symptom already set. Nothing you answer is stored or sent anywhere — the answers live in the address bar and nowhere else.

What this does not cover

These are the causes GrowingHQ holds rules for on japanese maple — not every cause there is. Where several problems look alike, the honest answer is often that they cannot be told apart by eye, and a page that named one would be guessing. If none of the above fits, the general crisp brown edges around the leaf margin page lists causes across all plants, and the Japanese maple profile lists the problems it is prone to.