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Red Buckeye
A small native understory tree whose brilliant red, tubular spring flowers are one of the finest hummingbird magnets in the South - blooming just as the ruby-throated hummingbirds return - though every part of it, especially its tempting nut-like seeds, is poisonous.
Safety notes IMPORTANT: red buckeye is TOXIC in all parts. The seeds ('buckeyes') look like a smooth brown nut but are POISONOUS - do NOT eat them; they and the leaves, shoots, flowers, and bark contain aesculin and saponins that cause vomiting, diarrhea, weakness, and in quantity serious poisoning in people, pets, and livestock. Keep the tempting seeds away from children and animals. The flowers' nectar is fine for hummingbirds and bees. It's a beautiful ornamental - just not a food.
Overview
Red buckeye (Aesculus pavia) is a small native tree or large shrub (12-20 feet) grown for one spectacular gift: its brilliant red, tubular spring flowers, held in showy upright clusters in early-to-mid spring, among the first big blooms of the season. Those flowers are one of the very best hummingbird plants in the South - and remarkably, red buckeye's bloom is timed to the spring return of the ruby-throated hummingbird, whose northward migration tracks the tree up the continent, so a red buckeye in bloom is a near-guaranteed hummingbird show.
Quick facts
- Sprouts in
- 40 daysRange: 20–80 days
- Soil temperature
- 70 °FRange: 60–80 °F
- Height
- 18 ftRange: 12–30 ft
- Spread
- 15 ftRange: 10–25 ft
- Cold
- Takes hard frostdamaged below -15°F
- Heat
- Struggles above 100°F
- Life cycle
- Perennial, lives about 60 years
- Save seeds
- About 150 days after plantingRange: 120–180 days
- Self-sows
- Yes, expect volunteers
- Soil
- Well-drained
- Water
- Medium
- Plant spacing
- 15 ftRange: 10–25 ft
When to plant
Fall sowing is open for 19 more days. Next: spring, Mar 27 to May 22.
- Direct sow Oct 4 – Nov 8 Open now · 19 days leftAbout 3 weeks before to 2 weeks after your first frost (Oct 25 here)Plant fresh seed in fall where the tree will grow - the seeds sprout fast, cannot be dried out, and make a deep root that resents transplanting. Handling them needs no precautions; they are dangerous only if eaten. Keep them from children and pets, and protect the sowing from squirrels.
- Transplant Mar 27 – May 22 Opens in 158 daysAbout 2 weeks before to 6 weeks after your last frost (Apr 10 here)Plant container red buckeye in early spring into moist, well-drained, humus-rich soil in sun to part shade; it establishes readily and makes a fine native understory or woodland-edge small tree. Site the poisonous seeds away from children and pets.
- Transplant Aug 26 – Oct 4 Opens in 310 daysAbout 9 weeks before to 3 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 4 · Getting established
Years 1-3 - young tree
About the first 3 years after planting
Care at this stage
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Water while establishing
Water a young red buckeye deeply and regularly through its first 2-3 years, especially in drought. It likes moist, well-drained, humus-rich soil in sun to part shade and roots in fairly readily for a woody plant; it has a deep root, so plant it small.
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Mulch the root zone
A ring of mulch conserves moisture and keeps mowers away; keep it back from the stems. Red buckeye is a small tree or large shrub (12-20 feet), ideal as a native understory or woodland-edge plant.
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Site it where the poisonous seeds won't be a hazard
Red buckeye is a lovely small tree, but ALL its parts - especially the tempting shiny brown seeds - are poisonous. Site it away from areas used by young children and pets who might pick up and eat the fallen 'buckeyes,' and plan to rake up the seeds where that's a concern.
Months are typical seasonal windows; climate, variety, and plant age can shift them.
Watch out for
3 to know. 1 is high-risk: Buckeye Toxicity (Poisonous Seeds & Foliage). 1 is active in October.
Buckeye Toxicity (Poisonous Seeds & Foliage)Severity High DisordernowSeason: Mar–OctFallen shiny brown seeds within reach of children, pets, or livestock; new spring shoots and leaves (also toxic) where grazing animals could eat them.
Fallen shiny brown seeds within reach of children, pets, or livestock; new spring shoots and leaves (also toxic) where grazing animals could eat them.
This is a use-and-siting matter, not a treatable disease: keep the poisonous parts out of mouths. If ingestion occurs, contact a doctor, poison control, or a veterinarian promptly.
Site red buckeye away from children's play areas and pet/livestock access; rake up and safely discard fallen seeds (in the trash, not accessible compost); teach that the nut-like seeds are NOT food. Handling the seeds is safe - only eating them is dangerous.
Not a pest but the plant's defining hazard: all parts of red buckeye - seeds, leaves, shoots, flowers, and bark - contain aesculin and saponins and are toxic if eaten. The shiny brown seeds ('buckeyes') are especially dangerous because they look like an edible nut and are tempting to children, pets, and livestock, causing vomiting, diarrhea, weakness, and, in quantity, serious poisoning.
Buckeye Leaf BlotchSeverity Low DiseaseSeason: Jun–AugIrregular brown blotches and scorched-looking areas on the leaves, worse in humid summers, sometimes hastening the tree's natural early leaf drop.
Irregular brown blotches and scorched-looking areas on the leaves, worse in humid summers, sometimes hastening the tree's natural early leaf drop.
None usually needed - it's cosmetic, and red buckeye's early leaf drop makes it largely irrelevant; leaf sanitation reduces it over time.
Ensure good air circulation, avoid overhead watering, and rake up fallen infected leaves to reduce spores; it rarely warrants more on a landscape tree.
A fungal disease that causes brown blotches and scorching on buckeye and horse chestnut leaves in warm, humid, wet weather, sometimes with early browning - unsightly but essentially harmless, and largely moot on red buckeye, which often drops its leaves early anyway.
Early Summer Leaf Drop (Natural Dormancy)Severity Low DisorderSeason: Jul–SepYellowing and dropping of the palmate leaves in mid-to-late summer, leaving the tree bare early, especially on hot, dry, sunny sites.
Yellowing and dropping of the palmate leaves in mid-to-late summer, leaving the tree bare early, especially on hot, dry, sunny sites.
None needed - the tree is not sick; it simply rests early and leafs out first again next spring. Consistent moisture and some shade keep it in leaf longer if you prefer.
Plant in part shade with moist, humus-rich soil and water in drought to delay the leaf drop; but understand that early dormancy is normal and not harmful.
Not a disease but a natural habit: red buckeye is an 'early-in, early-out' tree that leafs out very early in spring and often yellows and drops its leaves by mid-to-late summer, standing bare while other trees are still green - a normal response, worst in heat, drought, and full sun.
Good & bad neighbors
Plant nearby
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A native perennial hummingbird and pollinator magnet that blooms in summer, bridging the nectar gap after red buckeye goes dormant early - a good understory companion for a hummingbird garden.
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Another premier native hummingbird plant - cardinal flower's late-summer red blooms extend the hummingbird season after red buckeye's early-spring show, together feeding hummingbirds across the year in a part-shade planting.
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Two early-blooming native understory trees - red buckeye's red flowers and redbud's pink together light up the woodland edge in early spring and feed returning hummingbirds and early bees at the same time.
- Traditional pairings, thin evidence
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A classic native understory tree that blooms alongside red buckeye in spring beneath the high canopy, layering a woodland-edge planting with early flowers and wildlife value.
Varieties · 4
You pick one when you add Red Buckeye to your garden. Its days to maturity set your harvest window.
Red Buckeye (Aesculus pavia)
The wild species: a small (12-20 foot) native understory tree with brilliant red tubular spring flowers that are a premier hummingbird magnet, glossy palmate leaves, and poisonous nut-like seeds.
Variety details for Red Buckeye (Aesculus pavia)
Small multi-stemmed tree with upright clusters of red tubular flowers and palmate leaves.
speciesnativered-flowershummingbirdShade-tolerant and deer-resistant, with a natural early-summer leaf drop.
Yellow Red Buckeye (Aesculus pavia var. flavescens)
A naturally yellow-flowered form of red buckeye, with soft yellow (instead of red) spring flower clusters but the same habit, hummingbird value, and understory usefulness - a lovely alternative where a softer flower color is wanted.
Variety details for Yellow Red Buckeye (Aesculus pavia var. flavescens)
Red buckeye with clusters of pale yellow tubular spring flowers.
varietynativeyellow-flowershummingbirdBottlebrush Buckeye (Aesculus parviflora)
A DIFFERENT species, listed for comparison rather than as a form of red buckeye: a broad, spreading, suckering SHRUB with dramatic white bottlebrush flower spikes in SUMMER (June-July, well after red buckeye) and good fall color - a superb shade-tolerant native for massing, and also toxic-seeded.
Variety details for Bottlebrush Buckeye (Aesculus parviflora)
Broad suckering shrub with tall white bottlebrush flower spikes in summer.
related-speciesnativewhite-flowerssummer-bloomIts habit, size, spacing, and bloom months are all different from this page's, so use a bottlebrush buckeye guide rather than the red buckeye timeline if you are growing one.
Ohio Buckeye (Aesculus glabra)
A DIFFERENT species, listed for comparison: the Midwestern buckeye (state tree of Ohio), a small-to-medium tree with yellow-green spring flowers and the famous glossy brown 'buckeye' seeds carried as good-luck charms.
Variety details for Ohio Buckeye (Aesculus glabra)
Small-to-medium tree with palmate leaves, yellow-green flowers, and shiny brown seeds.
related-speciesnativeyellow-green-flowerssmall-treeAlso toxic in all parts, and more cold-hardy than red buckeye - but its size, range, and timing differ from this page's, so don't run an Ohio buckeye off the red buckeye timeline.
Grower tips
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