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Aesculus hippocastanum
horse chestnut
Balkan Peninsula — northern Greece, Albania, Bulgaria, North Macedonia; mixed mountain forests at 3,000-5,000 feet (900-1,500 m) elevationLearn more
Overview
Aesculus hippocastanum is horse chestnut (common horse chestnut), a large deciduous tree growing 50-75 feet (15-23 m) tall and 40-60 feet (12-18 m) wide with a massive spreading canopy. White flowers with yellow and red markings in erect conical panicles (candles) 8-12 inches (20-30 cm) in May-June. Dark green palmately compound leaves with 5-7 leaflets radiating from a central stalk, each leaflet 5-12 inches (13-30 cm) long. In Sapindaceae. Native to the Balkan Peninsula (northern Greece, Albania, Bulgaria, North Macedonia). Widely planted as a park and street tree across Europe since the 1600s. Leaf blotch (Guignardia aesculi) is the primary limitation — causes premature browning and leaf drop from July onward in most years, disfiguring the canopy by late summer. The horse chestnut leaf miner moth (Cameraria ohridella) compounds the foliage damage in affected regions. Spiny green fruit husks 2-3 inches (5-7 cm) split in October to release glossy brown seeds (conkers) — the heavy fruit drop creates litter and the spiny husks are a hazard on paths. Conkers are not edible (unlike sweet chestnuts, Castanea) — all parts contain saponins and glycosides. Toxic to pets and humans. Not drought-tolerant. Zones 4-8. Full sun to partial shade. Growth rate is moderate.
Native Range
Native to the Balkan Peninsula — northern Greece, Albania, Bulgaria, North Macedonia. Found in mixed mountain forests at 3,000-5,000 feet (900-1,500 m) elevation.Suggested Uses
Grown as a shade tree in large parks, estates, and institutional grounds with 40-60 feet (12-18 m) of lateral space. Not for small residential lots. Heavy spiny fruit litter — not for areas adjacent to paths or play areas. All parts toxic. Zones 4-8.How to Identify
Appearance
Size & Dimensions
Height50' - 75'
Width/Spread40' - 60'
Reaches mature size in approximately 25 years
Bloom Information
Late spring (May-June). White flowers with yellow and red basal markings in erect conical panicles (candles) 8-12 inches (20-30 cm). 4 weeks of bloom. Bee-pollinated. Spiny husks with glossy brown conkers ripen October.Detailed Descriptions
Flower Description
White with yellow and red markings at the base, in erect conical panicles (candles) 8-12 inches (20-30 cm) tallFoliage Description
Dark green in summer, palmately compound with 5-7 leaflets radiating from a central stalk, each leaflet 5-12 inches (13-30 cm) long; often disfigured by leaf blotch (Guignardia aesculi) by late summer — the foliage browns and drops prematurely; turns yellow-brown in fallGrowing Conditions
Sun Requirements
Requires 4-8 hours of direct sunlight daily
• Full Sun: 6+ hours of direct sunlight
• Partial Shade: 3-6 hours of direct sunlight
• Full Shade: Less than 3 hours of direct sunlight
Care & Maintenance
Care Guide
Full sun to partial shade (4-8 hours). Well-drained soil pH 5.5-7.5. Not drought-tolerant. Leaf blotch (Guignardia aesculi) causes premature browning — no cure; rake and destroy fallen leaves to reduce inoculum. Heavy fruit drop (spiny husks) in October. Prune in winter dormancy only. All parts toxic. Zones 4-8.Pruning
Prune only during winter dormancy (November-February). Remove dead, crossing, or damaged branches. Develop a strong central leader when young. The massive spreading canopy is the natural form — minimal pruning at maturity. Professional arborist work for mature specimens.Pruning Schedule
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