Alstonia spectabilis, commonly known as bitterbark, yellowjacket, milky yellowwood, leatherjacket, jackapple, hard milkwood or hard cheesewood, is a medium-sized species of tree in the dogbane family. It is native to eastern Malesia, Melanesia and northern Australia.
Blackboard tree is resistant to disease and generally not susceptible to illnesses. In terms of care, this plant is fairly low-maintenance. When grown outdoors it needs little watering, and larger plants typically do not require pruning. Smaller plants, however, should be pruned after they finish blooming. Blackboard treet is suitable for anyone with an outdoor area, such as a garden or deck, and does not need much gardening experience.
How to keep Alstonia Spectabilis.
Light
Blackboard tree needs a location with abundant sunlight to develop vigorously. Native to a region with intense sun and heat, it does very well under those conditions. Excessive shade inhibits its growth, while ample sunshine increases its vigor; however, too much exposure can result in sunscald.
Temperature
The Blackboard tree is indigenous to areas where temperatures typically range from 68 to 95°F (20 to 35°C). It prefers warmer climates with steady temperatures. If located in colder regions, consider providing warm shelter or indoor care during the harsh winter months.
Fertilizer
The timing of fertilizing a Blackboard tree is important. Apply fertilizer in early spring and continue monthly until early summer. Fertilizer encourages attractive blooms and supplies energy during both dormant and active growth phases.
Pot & Repot
When repotting a Blackboard tree, select a pot 1-2 inches (2.5–5.1 cm) larger that offers good drainage. Use a well-draining potting mix. Repot in spring or fall, making sure the root ball sits slightly below the rim of the pot. Water thoroughly after repotting and place the plant in a warm spot with indirect sunlight.
Botanical profile.
- Plant Type
- Tree
- Life Cycle
- Perennial
- Genus
- Alstonia
- Family
- Apocynaceae
- Hardiness Zone
- 9
- Mature Height
- 20.12 m
- Mature Spread
- 3.35 m
- Leaf Color
- Green
- Leaf Type
- Evergreen, Semi-evergreen
- Flower Color
- White, Cream
- Flower Size
- 0.51 cm to 1.02 cm
- Bloom Time
- Early spring, Mid spring, Late summer, Fall, Winter
- Planting Time
- Spring, Autumn
- Harvest Time
- Late spring, Early summer, Mid summer
- Native Area
- Nepal, Sri Lanka, India, Malaysia, Philippines, Bangladesh, Laos, Brunei, China, Indonesia, Cambodia, Vietnam, Myanmar, Bhutan, Thailand
Other names.
