Thu. Mar 13th, 2025
Plant Profile: Bottlebrush Buckeye – Uncover + Share
A large planting of shrubs with gold leaves lines a sidewalk leading to a large dome conservatory.
Bottlebrush buckeye strains a path resulting in the Climatron on the Missouri Botannical Backyard. Picture by Kristina DeYong.

Each fall, sensible golden foliage lights up the trail simply south of the Climatron on the Missouri Botanical Backyard. This incredible fall coloration comes from the bottlebrush buckeye, a big shrub native to the southeastern United States that additionally produces stunning summer season blooms. The showy shrub is a favourite sight in lots of seasons however is susceptible within the wild. 

A large plant has green leaves and cone shaped white flowers.
Bottlebrush buckeye produces showy white blooms in the summertime. Picture by Nathan Kwarta.

What’s bottlebrush buckeye?

Bottlebrush buckeye, Aesculus parviflora, is a shade blooming shrub that may develop as much as 12 toes excessive and 15 toes excessive. It’s famous as among the finest summer-flowering shrubs for shady space. It produces spectacular midsummer bloom with feathery, tubular white flowers with purple anthers. Butterflies and different pollinators love the flowers.

A close up photo shows a blue butterfly feeding on the tubular white flowers.
A butterfly enjoys the nectar of a bottlebrush buckeye flower. Picture by Nathan Kwarta.

The place is it from?

 Bottlebrush buckeye is native to wealthy woodland areas within the Southeastern United States. It now has a restricted vary of untamed populations. It’s discovered solely alongside waterways and bluffs in particular areas of Alabama, West Georgia, and West South Carolina.

Green bottlebrush buckeye grows behind a silver guardrail and a black and yellow traffic sign along a roadway.
Bottlebrush buckeye usually grows by roadsides within the wild. Picture by Jared Chauncy.

what threats does it face within the wild?

The most important threats to bottlebrush buckeye are herbicide and washout. Invasive species and human growth threaten the species as effectively. For the reason that species grows in bluffs and waterways, roadsides make the right habitat, however are in danger for washout.

A Backyard group working to preserve the species discovered giant flowering people have been discovered to solely develop in forest clearings, forest edges, and open ravines presumably as a result of better gentle. The opposite people of a inhabitants tended to kind very low operating non-flowering lots. This places the already low sexual copy of the species at even additional threat, as a result of flowering people usually tend to happen alongside roadsides the place herbicide spraying is widespread. This places the species in danger, particularly its genetic variety that’s possible remoted and linked to river basins.  

A man writing in a notebook stands in the grass close to a two lane road.
A Backyard employees member data details about bottlebrush buckeye throughout a amassing journey targeted on conservation in 2017. Picture by Jared Chauncey.

What’s the Backyard doing to avoid wasting this species?

In 2017, the Backyard obtained a grant for bottlebrush buckeye conservation. A Backyard group collected 23 new accessions of the species comprising at the very least 9 populations. Samples got here from totally different counties and states, representing a big geographic pattern of the species. The populations sampled included these from the perimeters of the species vary in addition to geographically remoted populations.

These detailed collections over the vary of the species will permit for a baseline for future research on the conservation, ecology, genetics, and horticulture of the species.

A close up photo of leaves shows them changing from green to a golden yellow.
Bottlebrush buckeye’s leaves flip a golden hue within the fall. Picture by Kristina DeYong.

The place did the collected samples go?

The Backyard group collected greater than 350 divisions of the species for the undertaking. The Backyard distributed these plant supplies to a number of establishments within the Central and Jap U.S. to make sure the fabric is safeguarded for future use. The institution of this metacollection, the place dwelling plant collections are managed collaboratively at a number of establishments, are crucial for uncommon species that can not be maintained in seed banks.  

The number of places, from USDA Zone 4 to Zone 9, additionally permits scientists to review how plant materials linked to assortment locality, ecology, and genetics grows beneath a number of local weather situations. The outcomes will yield knowledge useful to conservation efforts within the face of world local weather change.

It can additionally present knowledge and materials useful to horticulture. Other than extra refined traits like tolerance or kind, uncommon traits like branching flowers may probably be of great horticultural worth.

Brilliant gold leaves of a tall shrub line a sidewalk path. A tree with yellow fall follage is behind the planting.
The Knolls is ablaze with yellow coloration from Buckeye bottlebrush, Aesculus parviflora. Picture by Tom Incrocci.

The place can I discover bottlebrush buckeye within the Backyard?

A really giant planting of bottlebrush buckeye might be noticed on each side of the sidewalk main south from the Climatron on the Missouri Botanical Backyard.

Catherine Martin
Senior Publication Officer

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