Fraxinus sieboldiana, the Chinese flowering ash or Japanese flowering ash, is a species of flowering plant in the family Oleaceae. It is native to southeastern China, the Korean peninsula, and Japan. It is hardy to USDA zone 6. A variegated cultivar, 'Rising Sun', is available. It grows on wood slopes and by streams.
Chinese flowering ash is highly resistant to disease and generally does not tend to get sick. In terms of care, this plant is fairly low-maintenance. When grown outdoors it needs only light watering, and larger plants usually do not require pruning. Smaller plants, however, should be pruned after they finish blooming. Chinese flowering asht is suitable for anyone who has an outdoor area, such as a garden or deck, and it does not demand extensive care experience.
How to keep Fraxinus Sieboldiana.
Light
The Chinese flowering ash requires abundant light, closely matching the conditions of its native habitat. All stages of its growth prosper under such lighting, and it has no known tolerance for reduced light. Excessive light rarely causes problems, but a shortage of light can stunt its growth.
Water
The Chinese flowering ash, native to East Asia, thrives best in environments with moderate moisture. It needs regular watering every one to two weeks, although once it is established, it becomes drought-tolerant. This tree adapts well to different climates and requires less water during its dormancy in the colder months.
Temperature
Chinese flowering ash originates from habitats where temperatures are generally between 50 and 95 °F (10 to 35 ℃). It performs best in moderate climates. In extreme seasons, making slight adjustments toward its preferred temperature range can improve its growth.
Fertilizer
Proper timing matters when fertilizing Chinese flowering ash. Apply fertilizer in early spring and repeat monthly through early summer. Fertilizer encourages beautiful blooms and supplies energy during both dormant and active growth periods.
Pruning
The Chinese flowering ash is known for its beautiful flowers and leaves. To maintain its health and appearance, it's best to prune the tree in early spring. During pruning, focus on removing any dead branches, thinning out crowded areas, and shaping the tree to improve air circulation and sunlight exposure. Regular pruning not only encourages growth and blooming but also helps prevent diseases, so be sure to use clean tools. Additionally, take into account the seasonal weather and the tree's growth patterns when planning your pruning activities.
Botanical profile.
- Plant Type
- Tree, Shrub
- Life Cycle
- Perennial
- Genus
- Fraxinus
- Family
- Oleaceae
- Hardiness Zone
- 6-9
- Mature Height
- 4.88 m to 7.92 m
- Mature Spread
- 4.57 m
- Leaf Color
- Green, Dark Green
- Leaf Type
- Deciduous
- Flower Color
- White, Cream, Yellow
- Flower Size
- 7.62 cm to 12.70 cm
- Bloom Time
- Mid spring, Late spring
- Planting Time
- Spring, Autumn, Winter
- Harvest Time
- Late summer, Early fall, Mid fall
- Native Area
- Koppen, Japan, South Korea, China
Other names.
Reader questions.
What are the sunlight requirements for Chinese flowering ash?
The Chinese flowering ash requires an abundance of illumination, closely mimicking its native habitat conditions. Through varying growth stages, it thrives under full sun exposure, defined as above 6 hours of direct sunlight daily, and shows no known tolerance for diminished lighting. Observing how sunlight moves through your garden is crucial for choosing spots that offer the perfect balance of light and shade, ensuring the plant's happiness. While excess illumination rarely poses problems, a lack of sufficient sunlight can potentially stunt its growth.
What is the native environment of the Chinese flowering ash?
The Chinese flowering ash is native to environments where temperatures typically range from 50 to 95 °F (10 to 35 °C). It thrives best in moderate climates, which indicates its preference for not too extreme weather conditions. The plant has strong cold resistance, which implies that it generally does not require special frost protection measures during winter. However, in cases where winter temperatures are expected to drop below -25°C, it is important to provide cold protection by wrapping the trunk and branches with non-woven fabric or cloth. Additionally, it is recommended to water the plant abundantly before the first freeze in autumn to keep the soil moist and help prevent drought and water scarcity during winter and early spring.
How can artificial lighting benefit indoor Chinese flowering ash plants?
Indoor Chinese flowering ash plants require adequate lighting for optimal growth, especially when natural sunlight is insufficient, such as in winter or in less sunny spaces. Artificial lights, especially LEDs that can be customized to provide specific wavelengths, offer a vital solution. For plants requiring full sun, 30-50W/sq ft of artificial light is needed, partial sun plants need 20-30W/sq ft, and full shade plants require 10-20W/sq ft. The light source should be placed 12-36 inches above the plant to mimic natural sunlight, ensuring most plants get 8-12 hours of light per day.
How does low temperature affect the Chinese flowering ash, and what are the solutions?
The Chinese flowering ash is cold-tolerant and performs best when the temperature is kept above 10°C. In winter, it is advisable to keep the temperature above -15°C. When the temperature falls below -25°C, while there might not be visible changes during the winter, the branches may become brittle and dry, and no new shoots will emerge in spring. As a solution, in spring, it is recommended to prune away any dead branches that have failed to produce new leaves. This helps the plant to recover and continue its growth cycle.
What are the symptoms of light deficiency in Chinese flowering ash?
Chinese flowering ash shows several symptoms when exposed to suboptimal lighting, including smaller new leaves, leggy or sparse growth, faster leaf drop, slower or no new growth, lighter-colored new leaves, chlorosis, sunscald, leaf curling, wilting, and leaf scorching. These symptoms indicate a need for increased light exposure to maintain health and growth.
How does high temperature affect the Chinese flowering ash, and what are the solutions?
During summer, it is important to ensure that the Chinese flowering ash is kept below 35°C. When temperatures exceed 38°C, the plant's leaves may lighten in color, and the tips may dry and wither, making the plant more susceptible to sunburn. To address this, trimming away the sunburned and dried-up parts of the plant is advisable. Moving the plant to a location that provides shade during the midday and afternoon sun, or using a shade cloth, can help protect it from excessive heat. Furthermore, watering the plant in the morning and evening can help keep the soil moist and reduce stress on the plant.
What are the solutions for addressing light deficiency in Chinese flowering ash?
For indoor plants, ensure they receive at least 6 hours of direct sunlight daily by gradually moving them to sunnier locations each week. Utilize a south-facing window and keep curtains open during the day. For larger or immovable plants, consider using artificial light, keeping a desk or ceiling lamp on for at least 8 hours daily, or investing in plant grow lights. Outdoors, gradually adapt plants to sunnier spots to avoid sunburn. Reducing obstructions such as pruning trees can help, and for smaller plants, consider transplanting during their dormant period to a location with ample sunlight and good drainage. Note that parts of the plant affected by insufficient sunlight may not recover, but new growth after increasing light exposure will be healthy.
