Aesculus x carnea, commonly known as red horsechestnut or pink horsechestnut, is a hybrid tree species that results from crossing Aesculus hippocastanum (common horsechestnut) and Aesculus pavia (red buckeye). It is a deciduous tree that can reach a height of up to 40 feet (12 meters) and a spread of up to 30 feet (9 meters).
The tree has a broad, rounded crown with dark green leaves that are palmately compound with five to seven leaflets. The flowers are pink or red in color and appear in the spring, usually in May. They are arranged in upright, cone-shaped clusters that are 6 to 10 inches (15 to 25 cm) tall. The fruit is a brown, spiny capsule that contains one or two shiny brown seeds, or conkers.
Aesculus x carnea is a popular ornamental tree because of its showy flowers and attractive foliage. It prefers full sun to partial shade and well-drained soil. It is tolerant of urban conditions and pollution, making it a good choice for planting along streets or in city parks. However, it is susceptible to several diseases, including leaf blotch and powdery mildew, and can also be attacked by pests such as Japanese beetles and spider mites.