Bottlebrush buckeye is a flowering plant in the genus Aesculus. The species is native to the southeastern United States, where it is found in woodlands and floodplains. It is a deciduous shrub or small tree growing to 6 m (20 ft) tall, with opposite, palmately compound leaves with five leaflets. The flowers are borne in panicles of 10-20, each flower with a white corolla with a long red or orange pistil. The fruit is a smooth, spiny capsule containing three nuts.
Related plant:
Little John Bottlebrush
About soil condition, the bottlebrush buckeye prefers moist, well-drained soil but will tolerate less-than-ideal conditions, including clay soil. It is not tolerant of salt, so it is best to avoid sites near roadways where de-icing salt is used. The bottlebrush buckeye does not like to be transplanted, so it is best to choose its planting site carefully.
So, like the other buckeye trees, the bottlebrush buckeye prefers full sun. It will also do well in partial sun, but it may not flower as much. The bottlebrush buckeye is a native of the southeastern United States. It grows in zones 5-9.
The temperature condition that is best for the bottlebrush buckeye is a bit cool. This plant does not like it too hot or too cold. The best temperature for this plant is between 65 and 75 degrees Fahrenheit.
Ideal humidity condition for this plant is around 60%. If the humidity is too low, the leaves will start to turn brown and drop off. If the humidity is too high, the leaves will start to yellow and drop off. If you are having trouble keeping the humidity at the right level, you can try misting the plant with water.
About fertilizer, this kind of plant need full sun and well-drained soil, also need more water when they are in growth period. They are not drought tolerant. When you are planting, you should use a general-purpose fertilizer and water it deeply. The best time to water them is in the morning, so the leaves can dry before nightfall. If the leaves stay wet overnight, they are more likely to develop fungal diseases.
Pruning your bottlebrush buckeye (Aesculus parviflora) is an important step in keeping your plant healthy and looking its best. You'll want to prune away any dead or damaged branches, as well as any branches that are crossing or rubbing against each other. You can prune your bottlebrush buckeye in the spring or summer.
Propagation is usually by seed, which can be sown in spring or fall, preferably after stratification. Sow seed 1/4 inch deep in a moist, well-drained soil mix. The seed will germinate in one to two months at 75 degrees F. Transplant seedlings to individual pots when they are large enough to handle and grow them on for the first year. After that, they can be planted out in the garden.
Usually, the plant growth rate is determined by the growing conditions. In areas with hot, humid summers and winters with little or no snow cover, the bottlebrush buckeye can grow up to 3 feet per year. In cooler areas with adequate snow cover, growth may be only 1 foot per year.
Common problems for this kind of plant are generally fungal diseases, such as leaf spot, stem cankers, and powdery mildew. These can be controlled with fungicide sprays. Insect problems are generally not a major problem for this plant, but aphids, scale, and whiteflies can occasionally be troublesome.
Source:
Bottlebrush Buckeye | UMD Arboretum & Botanical Garden
Bottlebrush Buckeye - Aesculus parviflora | North Carolina
POTW: Bottlebrush Buckeye: University of Illinois Extension