Photo by Melody

PlantFiles: Red Horsechestnut, Red Horse Chestnut
Aesculus x carnea 'Briottii'

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Family: Sapindaceae (sap-in-DAY-see-ee) (Info)
Genus: Aesculus (ES-kew-lus) (Info)
Species: x carnea
Cultivar: Briottii
Additional cultivar information: (A. hippocastanum x A. pavia)

2 members have or want this plant for trade.

Category:
Trees

Height:
20-30 ft. (6-9 m)
30-40 ft. (9-12 m)

Spacing:
20-30 ft. (6-9 m)
30-40 ft. (9-12 m)

Hardiness:
USDA Zone 5a: to -28.8 C (-20 F)
USDA Zone 5b: to -26.1 C (-15 F)
USDA Zone 6a: to -23.3 C (-10 F)
USDA Zone 6b: to -20.5 C (-5 F)
USDA Zone 7a: to -17.7 C (0 F)
USDA Zone 7b: to -14.9 C (5 F)
USDA Zone 8a: to -12.2 C (10 F)
USDA Zone 8b: to -9.4 C (15 F)

Sun Exposure:
Full Sun
Sun to Partial Shade

Danger:
All parts of plant are poisonous if ingested

Bloom Color:
Red

Bloom Time:
Late Spring/Early Summer

Foliage:
Deciduous
Shiny/Glossy-Textured

Other details:
This plant is attractive to bees, butterflies and/or birds
Average Water Needs; Water regularly; do not overwater

Soil pH requirements:
6.1 to 6.5 (mildly acidic)
6.6 to 7.5 (neutral)

Patent Information:
Non-patented

Propagation Methods:
From seed; direct sow outdoors in fall

Seed Collecting:
Seed does not store well; sow as soon as possible

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There are a total of 19 photos.
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Profile:

1 positive
2 neutrals
No negatives

Gardeners' Notes:

RatingAuthorContent
Neutral DaylilySLP On Sep 4, 2014, DaylilySLP from Dearborn Heights, MI (Zone 6a) wrote:

Culture

Easily grown in average, medium moisture, well-drained soils in full sun to part shade. Prefers moist, fertile soils. Foliage tends to scorch and generally depreciate in dry conditions. Once established, it can be difficult to transplant because of its taproot. Plants produce viable seed.

Noteworthy Characteristics

Red horse chestnut is a hybrid (A. hippocastanum x A. pavia) that was discovered in Europe in 1812. It is a small, oval to rounded, deciduous tree that grows 30-40 tall, and is perhaps best noted for its attractive red flowers. It features dark green palmate compound leaves with 5 (less frequently 7) spreading ovate-oblong leaflets (6-10 long). Leaflets have doubly-toothed margins. Fall color is somewhat undistinguished. Very showy red flowers appear in upright terminal panicles (to 6-8 long) in mid-spring (May in St. Louis). Flowers are followed by slightly prickly husky capsules (1.5 diameter), each typically containing two or three nuts. Nuts are poisonous.

Briotii is a cultivar that was named in 1858 to honor Pierre Louis Briot, the nurseryman at Trianon-Versailles near Paris, France. In comparison to Aesculus x carnea, this cultivar is perhaps best noted for its darker red flowers and larger flower panicles. Dark red flowers appear in upright terminal panicles (to 8-10 long) in mid-spring (May in St. Louis). Flowers are followed by slightly prickly husky capsules (1.5 diameter), each typically containing two or three nuts.

Problems

Leaf blotch can be a significant problem. Powdery mildew and leaf spots may also occur. Bagworms, Japanese beetles and borers are infrequent but potentially troublesome. Leaf scorch (brown edges) may occur in droughty conditions or on sites exposed to wind. In general, this tree has better disease resistance and its foliage is less apt to depreciate as the growing season progresses than is the case with A. hippocastanum.

Garden Uses

A beautiful landscape tree for parks and large lawns. Depreciation of the foliage during the growing season due to disease, insect and scorching problems somewhat limits its value. Often not recommended as a street tree because of litter problems (nuts, twigs, leaves). It may be planted as a shade tree.

Neutral humulus_lupulus On Sep 4, 2014, humulus_lupulus wrote:

Positive braun06 On May 11, 2005, braun06 from Peoria Heights, IL (Zone 5b) wrote:

This plant has proven quite tough even as it was in constantly wet soil for a couple months followed by completely dry soil for a couple months after its planting. Here in central Illinois it tends to flower starting in late April through mid to late May. I would expect a good three to four weeks of flowers from this tree depending upon the weather. We had a light freeze in late April and it didnt affect the flowers or foliage a bit. Come summer there is a bit of leaf browning from disease but it doesnt become a significantly noticable problem. Briotti provides a truly rare flower color for a tree growing in a temperate climate, and makes an excellent shade tree when its gotten to a more mature size. A foot of growth is considered good for one year. *UPDATE 4-5-07* We are experiencing lows around 20 for nearly a week, after nearly a month of lows above 45 degrees. We didnt experience any frost this week but the really cold temperatures did completely wilt and shrivel the new growth of the past month, including the flowers. It does somehow appear that maybe 6 out of 20 flowers somehow survived the extreme temperatures.

Regional...

This plant has been said to grow in the following regions:

San Leandro, California
Fort Collins, Colorado
Ellijay, Georgia
Hanna City, Illinois
Clermont, Kentucky
Lexington, Kentucky
Louisville, Kentucky
Bishopville, Maryland
Cincinnati, Ohio
Manquin, Virginia
Cambridge, Wisconsin



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