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American Sycamore
One of the most massive trees of eastern North America - a fast-growing giant of riverbanks and bottomlands, unmistakable for its striking mottled, peeling bark that glows ghostly white, and for the dangling 'buttonball' seeds that give it its folk names.
Safety notes American sycamore is safe to handle - a large shade and riparian tree, not a food plant. Two allergy notes: the fine hairs shed by new leaves and seed balls irritate eyes, nose, and throat ('sycamore itch'), and plane/sycamore pollen is a documented spring aeroallergen, so allergy-sensitive households should site it well away from bedroom windows and seating. It is also messy (bark, leaves, twigs, seed balls), and its size and spreading roots need room away from buildings and pipes.
Overview
The American sycamore (Platanus occidentalis) is a giant among eastern trees - one of the most massive by trunk diameter on the continent, a fast-growing colossus of riverbanks and bottomlands that commonly reaches 75-100+ feet with an enormous trunk and a broad, spreading crown. Its most famous feature is its bark: the outer bark flakes away in irregular puzzle-piece patches to reveal a smooth, camouflage patchwork of cream, tan, olive, and white beneath, so that the upper trunk and branches glow a striking, ghostly white - unmistakable across a winter landscape.
Quick facts
- Sprouts in
- 30 daysRange: 15–60 days
- Soil temperature
- 70 °FRange: 60–80 °F
- Height
- 100 ftRange: 75–140 ft
- Spread
- 70 ftRange: 50–90 ft
- Cold
- Takes hard frostdamaged below -30°F
- Heat
- Struggles above 105°F
- Life cycle
- Perennial, lives about 250 years
- Save seeds
- About 180 days after plantingRange: 150–210 days
- Self-sows
- Yes, expect volunteers
- Soil
- Tolerates wet soil
- Water
- Medium
- Plant spacing
- 60 ftRange: 40–80 ft
When to plant
Fall sowing is open for 27 more days. Next: spring, Mar 27 to May 22.
- Direct sow Oct 11 – Nov 15 Open now · 27 days leftAbout 2 weeks before to 3 weeks after your first frost (Oct 25 here)Sow seed from the broken-up seed balls on moist, bare ground in fall or spring; sycamore self-sows readily on wet riverbanks and mudflats. Transplants are far faster to a usable tree.
- Transplant Mar 27 – May 22 Opens in 159 daysAbout 2 weeks before to 6 weeks after your last frost (Apr 10 here)Plant container or B&B trees in spring into moist, deep soil in full sun, ideally near water or in a low, damp area; spring planting lets roots establish before winter, and sycamore grows very fast once settled in.
- Transplant Aug 16 – Sep 27 Opens in 301 daysAbout 10 weeks before to 4 weeks before your first frost (Oct 25 here)Fall planting works in milder zones; keep the roots moist through establishment.
Frost here: last around Apr 10 (Mar 27 to Apr 24 most years), first around Oct 25. Zone averages, your own yard may run a week or two either way.
Life stages
Establish, grow, repeat
Getting established and returning each season are different parts of the story.
Stage 1 of 3 · Getting established
Years 1-3 - fast young tree
About the first 3 years after planting
Care at this stage
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Keep it moist while establishing
Water a young sycamore deeply and regularly through its first 2-3 years. It's a bottomland, streamside tree that loves moist ground and grows very fast - keep it well watered, and it can add several feet a year once settled in.
-
Mulch the root zone
A wide mulch ring conserves the moisture sycamore loves and keeps mowers off the trunk; keep it back from the bark. Sycamore has large, spreading, often surface roots that can lift pavement and invade pipes, so plan the site accordingly.
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Site it with LOTS of room for a huge tree
American sycamore becomes one of the most massive trees in eastern North America - 75-100+ feet tall with an enormous trunk and spreading roots. Give it a large, open, moist site well away from buildings, pavement, sewer and drain lines, and power lines; this is a tree for parks, big yards, and streamsides, not small lots.
Months are typical seasonal windows; climate, variety, and plant age can shift them.
Watch out for
3 to know. None are high-risk for American Sycamore. None are active in October.
Sycamore AnthracnoseSeverity Medium DiseaseSeason: Apr–JunBrown, dead areas following the veins of young leaves in a cool wet spring, blackened dying shoot tips, heavy premature leaf drop, and clusters of twiggy regrowth after repeated infection.
Brown, dead areas following the veins of young leaves in a cool wet spring, blackened dying shoot tips, heavy premature leaf drop, and clusters of twiggy regrowth after repeated infection.
None usually warranted on a large tree - it re-leafs and recovers; sanitation reduces severity, and fungicide is generally impractical and unnecessary except for high-value young trees in wet regions.
Rake up and remove fallen infected leaves and prune out blighted twigs to reduce overwintering spores; ensure good air circulation; plant the resistant London plane (or a resistant cultivar) on problem or urban sites.
The main disease of American sycamore: a fungus that infects and kills expanding leaves and new shoots in cool, wet spring weather, causing brown, dead patches along the leaf veins, curled and blighted leaves, shoot dieback, and often heavy early leaf drop and a witches'-broom of twiggy regrowth. It's disfiguring but rarely kills an established tree.
Seed & Leaf Hair IrritationSeverity Low DisorderSeason: Apr–JunFine fuzzy hairs on new leaves and dispersing seed-ball fluff in spring, and throat/eye/skin irritation, sneezing, or coughing in sensitive individuals near the tree - which may be a pollen allergy rather than the hairs.
Fine fuzzy hairs on new leaves and dispersing seed-ball fluff in spring, and throat/eye/skin irritation, sneezing, or coughing in sensitive individuals near the tree - which may be a pollen allergy rather than the hairs.
No treatment needed for the tree; sensitive people can limit close exposure during the spring shedding and pollen period, and anyone with persistent seasonal symptoms should treat it as the pollen allergy it may be rather than a passing nuisance.
Site large sycamores away from patios, bedroom windows, and seating areas where people spend time in spring. The hair irritation is brief and seasonal, tied to leaf-out and seed-ball breakup; the pollen season is separate, so an allergy-sensitive household should choose the planting spot with both in mind.
Not a plant disease but a human nuisance: sycamore's new spring leaves and its breaking-up seed balls shed fine hairs that become airborne and can irritate the eyes, nose, throat, and skin of sensitive people, sometimes causing a brief spring cough sometimes called 'sycamore itch.' Sycamore is also a spring allergen in its own right - plane/sycamore produces wind-borne pollen (the Pla a allergens) that is a documented cause of seasonal allergic rhinitis and asthma flares in plane-planted areas. For a genuinely pollen-allergic person the spring symptoms near the tree are not only trichomes, and not necessarily minor.
Sycamore Lace BugSeverity Low PestSeason: Jun–SepFine yellow-to-white stippling and bronzing on the upper leaf surface, tiny lacy insects and shiny black excrement spots on the undersides, worse in hot, dry summers.
Fine yellow-to-white stippling and bronzing on the upper leaf surface, tiny lacy insects and shiny black excrement spots on the undersides, worse in hot, dry summers.
Rarely warranted on a big tree - the damage is cosmetic and the tree tolerates it; a strong hose spray or insecticidal soap helps on accessible young trees if desired.
Encourage the lacewings, lady beetles, and other predators that control lace bugs; keep the tree vigorous and watered, since drought-stressed trees suffer more.
Tiny, lacy-winged sap-sucking insects that feed on the undersides of sycamore leaves in summer, causing a fine yellow-white stippling on the upper leaf surface and dark 'varnish' spots of excrement beneath; heavy infestations can bronze the foliage but rarely harm a large, established tree.
Good & bad neighbors
Plant nearby
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Two grand, wet-tolerant natives of streambanks and floodplains - sycamore and bald cypress together anchor a riparian or rain-garden planting where standing water and moist ground would defeat most large trees.
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A native of wet, part-shaded streamside ground that thrives at a sycamore's moist edge, adding brilliant red hummingbird flowers to a riparian or rain-garden planting.
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Both thrive on moist, low, bottomland ground - fast red maple beside massive sycamore makes a natural wet-woodland pairing, with the maple filling in beneath and beside the sycamore's high canopy.
- Traditional pairings, thin evidence
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A native shrub of moist streambanks and low ground that fits naturally beneath and beside a sycamore in a wet-woodland or riparian planting, adding flowers, berries, and wildlife value.
Varieties · 4
You pick one when you add American Sycamore to your garden. Its days to maturity set your harvest window.
American sycamore (Platanus occidentalis) 1 variety
American Sycamore (Platanus occidentalis)
The wild native: one of the most massive eastern trees (75-100+ feet), fast-growing, superbly wet-tolerant, with striking mottled cream-and-white peeling bark, huge leaves, and dangling buttonball seeds.
Variety details for American Sycamore (Platanus occidentalis)
Enormous tree with ghostly-white mottled peeling bark, big maple-like leaves, and round hanging seed balls.
speciesnativevery-largewet-tolerantA grand riparian and shade tree for big, moist spaces - messy and anthracnose-prone but magnificent.
London plane (Platanus x acerifolia) 3 varieties
London Plane (Platanus x acerifolia)
A different species, not a cultivar of American sycamore: a hybrid of American and Oriental plane that keeps the mottled bark and grand form but resists anthracnose far better and tolerates pollution, compaction, and hard pruning.
Variety details for London Plane (Platanus x acerifolia)
Large tree with mottled bark and maple-like leaves, more disease-resistant and urban-tolerant than the native.
hybridnot-nativeanthracnose-resistanturban-toughBecause it is a garden hybrid it is native nowhere - this page's native range, native states, and -30F cold rating describe P. occidentalis, not this tree, which is hardy to about zone 5. The go-to 'sycamore' for cities, streets, and tough sites.
Bloodgood (London plane cultivar)
A widely planted cultivar of the London plane hybrid (not of American sycamore) selected for good anthracnose resistance, a uniform upright form, and toughness - one of the standard street and park trees where a large, mottled-barked, disease-resistant tree is wanted.
Variety details for Bloodgood (London plane cultivar)
Vigorous, uniform planetree with mottled bark and good disease resistance.
cultivarhybridnot-nativeanthracnose-resistantLike its parent it is a garden hybrid, native nowhere, and hardy to about zone 5.
Exclamation! (London plane cultivar)
A modern cultivar of the London plane hybrid (not of American sycamore), with a strong central leader, uniform pyramidal-to-oval form, and excellent anthracnose and powdery-mildew resistance - bred as an improved, more uniform large street and shade tree.
Variety details for Exclamation! (London plane cultivar)
Uniform, upright planetree with a strong leader, mottled bark, and improved disease resistance.
cultivarhybridnot-nativeanthracnose-resistantLike its parent it is a garden hybrid, native nowhere, and hardy to about zone 5.
Grower tips
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