Sourwood (Oxydendrum arboreum) Starter
Sourwood is a native deciduous tree known for its brilliant red fall color, elongated leaves, and drooping clusters of white flowers that resemble lily-of-the-valley blooms. Though rarely seen in bonsai, it offers unique potential for growers who enjoy working with native species and trees that bring bold seasonal transitions.
 
As a Bonsai:
Sourwood is a challenging but rewarding species for bonsai. Its leaves are relatively large and don’t reduce easily, so it’s best suited to medium to large bonsai styles or naturalistic forms. It responds to pruning and can develop nice taper and movement with time. Its vivid fall foliage and unusual flowering habit make it a visually interesting choice for ambitious growers.
 
📢 This is a cold-hardy species—it requires a winter dormancy and should be kept outside year-round. In locations with extreme cold, we recommend placing it on the ground, mulching around the pot, and protecting it from wind.
 
Plant Features:
Hardiness Zone: 5–9 (cold-hardy and requires winter dormancy)
Growth Habit: Upright with a slightly irregular, picturesque form
Mature Size: 20–30 ft in the landscape; best suited for larger bonsai
Foliage: Long, narrow green leaves that turn vivid red in fall
Flowers: White, bell-shaped flowers in drooping clusters (mid to late summer)
Bark: Light gray, becoming ridged and furrowed with age
Sun Requirements: Full sun to partial shade
Soil Type: Acidic, well-draining soil; dislikes alkaline conditions
Water Needs: Moderate; prefers moist but not soggy soil
Special Features: Intense fall color, uncommon native bonsai material, eye-catching flower display