General Plant Information (Edit)
Plant Habit: Tree
Life cycle: Perennial
Sun Requirements: Full Sun
Full Sun to Partial Shade
Water Preferences: Mesic
Soil pH Preferences: Moderately acid (5.6 – 6.0)
Slightly acid (6.1 – 6.5)
Neutral (6.6 – 7.3)
Slightly alkaline (7.4 – 7.8)
Minimum cold hardiness: Zone 4a -34.4 °C (-30 °F) to -31.7 °C (-25 °F)
Maximum recommended zone: Zone 8b
Plant Height: 15 to 40 feet
Plant Spread: 15 to 40 feet
Leaves: Deciduous
Broadleaf
Other: Leaves emerge light green, mature to dark green and then yellow in the fall.
Fruit: Edible to birds
Other: 1 to 3 inch, brown capsules
Fruiting Time: Fall
Flowers: Showy
Flower Color: Red
Bloom Size: 2"-3"
Flower Time: Spring
Underground structures: Taproot
Uses: Shade Tree
Wildlife Attractant: Bees
Birds
Butterflies
Resistances: Pollution
Toxicity: Fruit is poisonous
Pollinators: Bees
Miscellaneous: Monoecious

Image
Common names
  • Red Horse-Chestnut
  • Bottlebrush Buckeye
Also sold as:
  • O'Neill's Red

Photo Gallery
Location: Hidden Lake Gardens, Michigan
Date: 2012-04-12
Cluster of bloom buds, and new leaves, on a young specimen of Aes
Location: Hidden Lake Gardens, Michigan
Date: 2012-04-12
New leaves on a young specimen of Aesculus x carnea 'O'Neill Red'
Location: Schreiner's Gardens near Salem, OR
Date: 2015-05-14
Location: Hidden Lake Gardens, Michigan
Date: 2021-05-29
Aesculus x carnea 'O'Neill Red' - featuring a single bloom in a p
Location: Columbus, Ohio USA, Zone 6b
Date: 2021-05-22
Bloom is fading in this photo.
Location: Schreiner's Gardens near Salem, OR
Date: 2015-05-14
Location: Columbus, Ohio USA, Zone 6b
Date: 2021-05-22
Location: Hidden Lake Gardens, Michigan
Date: 2021-05-29
Aesculus x carnea 'O'Neill Red' - A young tree, planted in 2011.
Location: Hidden Lake Gardens, Michigan
Date: 2021-05-29
Aesculus x carnea 'O'Neill Red' - Bloom panicle in late May
Location: Columbus, Ohio USA, Zone 6b
Date: 2021-05-22
Location: Heathcote Ontario Canada
Date: 2018    august
Aesculus x carnea'O'Neill Red'   Seedpod on a supposedly sterile

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