How to Manage Pests

Pests in Gardens and Landscapes

California buckeye, Horse chestnut—Aesculus californica
Family Hippocastanaceae (Horsechestnut family)

Plant Identification

Aesculus spp. are large deciduous trees or shrubs growing up to 20 feet high or taller and 30 feet wide.  Leaves are arranged in a fanlike appearance and are divided into toothed leaflets.  Flowers are formed at the ends of branches in clusters.  Flower color varies among species and may be red, orange, pink or cream-colored.  Plants produce pear-shaped fruit and brown seeds that are toxic. This tree goes dormant in the summer. Leaves yellow and eventually drop. 

Optimum conditions for growth

Aesculus does well in areas with full sun and moderate to regular amounts of water.  Prune to remove dead and damaged wood and branches. 

Leaves and flowers of California buckeye
Leaves and flowers of California buckeye


Pests and disorders of Aesculus californica



Environmental disorders



Normal dormancy
Normal summer dormancy of buckeye

Statewide IPM Program, Agriculture and Natural Resources, University of California
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