Aesculus Species, Conker Tree, Horse Chestnut

Aesculus hippocastanum

Family: Sapindaceae (sap-in-DAY-see-ee) (Info)
Genus: Aesculus (ES-kew-lus) (Info)
Species: hippocastanum (hip-oh-KAS-tan-um) (Info)



Water Requirements:

Average Water Needs; Water regularly; do not overwater

Sun Exposure:

Sun to Partial Shade



Foliage Color:

Unknown - Tell us


over 40 ft. (12 m)


20-30 ft. (6-9 m)


USDA Zone 3a: to -39.9 C (-40 F)

USDA Zone 3b: to -37.2 C (-35 F)

USDA Zone 4a: to -34.4 C (-30 F)

USDA Zone 4b: to -31.6 C (-25 F)

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)

Where to Grow:

Grow outdoors year-round in hardiness zone


Parts of plant are poisonous if ingested

Bloom Color:

White/Near White

Bloom Characteristics:

This plant is attractive to bees, butterflies and/or birds

Bloom Size:

Unknown - Tell us

Bloom Time:

Late Spring/Early Summer

Other details:

Unknown - Tell us

Soil pH requirements:

6.1 to 6.5 (mildly acidic)

6.6 to 7.5 (neutral)

7.6 to 7.8 (mildly alkaline)

Patent Information:


Propagation Methods:

From semi-hardwood cuttings

From seed; direct sow outdoors in fall

From seed; winter sow in vented containers, coldframe or unheated greenhouse

From seed; stratify if sowing indoors

Seed Collecting:

Allow pods to dry on plant; break open to collect seeds

Wear gloves to protect hands when handling seeds

Properly cleaned, seed can be successfully stored


This plant is said to grow outdoors in the following regions:

San Francisco, California

Stanford, California

Hinsdale, Illinois

Benton, Kentucky

Dennis, Massachusetts

Milton, Massachusetts

Minneapolis, Minnesota

Saint Cloud, Minnesota

Great Falls, Montana

Greenwood Lake, New York

Raleigh, North Carolina

Cincinnati, Ohio

Salem, Oregon

, Syddanmark

Orem, Utah

Seattle, Washington

Spokane, Washington

show all

Gardeners' Notes:


On Jul 20, 2021, markdeutsch from Pass Christian, MS wrote:

One of these entries says it's flowering in Zone 9b. Plantfiles officially limits it to a maximum of 6b. Shouldn't the range report be modified ?


On Aug 24, 2015, Rickwebb from Downingtown, PA wrote:

This European species is occasionally planted in parks and some residences in the Chicago, IL, area and other parts of the Midwest. Some larger conventional nurseries some sell this, as Hinsdale Nursery. It does well there. It does get hit harder by the buckeye leaf blotch disease that shows up in late summer than do native buckeyes, and it can get leaf burn from hot, dry, windy summer weather. Its large flower clusters are mostly white and its spiny capsules and brown seed are larger than that of buckeyes, as are its large 7 leaflet compound leaves. I saw a huge abundance of this species planted in western Europe in the 1980's.


On Sep 26, 2008, nlafrance3 from Edmonton, AB (Zone 4a) wrote:

There are a couple of mature ones growing in Edmonton, AB zone 3a/b that I know of. One downtown has been there for decades and its about 40 feet tall. Beautiful tree that looks like an Ohio buckeye with nice spring flowers.


On Jun 3, 2008, Malus2006 from Coon Rapids, MN (Zone 4a) wrote:

Very uncommon tree species here in the Twin Cities - I have only seen them in tree collections but recently I saw some planted along a street - their distinct white flowering gives them away plus their leaves look like buckeyes but they are not as sensitive as buckeyes. Do anyone know why they are rare?
Their seeds are poisonous and also they grows bigger and taller than buckeyes. I have seen one at St. Cathrine Campus - St. Paul also seem to be decades old - makes one wonder why there was a trend of growing them in the past and then stopped selling them?


On May 9, 2005, doss from Stanford, CA (Zone 9b) wrote:

This tree is very happy in zone 9. It is grown along roads and among other trees. It is very slow to bloom in the spring, flowers coming in May here but staying on the tree a very long time. Seed pods are beautiful and stay from midsummer until late November when they seem to fall all at once, about a month after the leaves fall. They can grow very tall, although very old trees here can be only 30 feet fall, or even smaller if they are planted in the shade. The trunk and limbs are twisted and the bark is interesting, leaving the tree very beautiful when it's dormant.


On Jul 8, 2004, melody from Benton, KY (Zone 7a) wrote:

This tree can get 60' to 75' tall. The compound leaves have 7 to 9 wedge shaped leaflets. The end bud is more than 1/2" long and very sticky. The white flowers are held in clusters that are 6" to 12" long. The fruits have strong thorny husks and ripen in Sept/Oct.


On Aug 1, 2002, smiln32 from Oklahoma City, OK (Zone 7a) wrote:

Originated in the mountains of Greece and Albania. Does not like very dry conditions.