Northern catalpa
Catalpa bignonioides · Bignoniaceae
📷 Zeynel Cebeci · CC BY-SA 4.0
The gardener's calendar
In autumn, ease off feeding and take the chance to clean up around northern catalpa and prepare for winter.
ID card
- Common name
- Northern Catalpa
- Family
- Bignoniaceae
- Type
- Deciduous tree
- Mature height
- 10 to 12 meters
- Spread
- 8 to 10 meters
- Flowering
- June to August
- Hardiness
- Down to -15 °C
- Origin
- North and South America
✓ Taxonomy verifiedSource: AI estimate · hardiness: reliability medium.
Expert tips
The key tip
Catalpa loves fertile soil and needs formative pruning when young to develop a clear trunk.
The common mistake
Letting it grow unchecked often results in a low, dense crown that's difficult to correct later.
The pro's trick
Remove lower suckers every spring to keep the trunk clean and visible.
Care
Sunlight
Catalpa bignonioides prefers full sun exposure for optimal flowering and dense foliage. It tolerates partial shade but will flower less abundantly. Plant it in a location sheltered from strong winds that could damage its large leaves.
Watering
Water the young tree regularly during its first year to promote rooting. Once established, the tree resists summer drought well and only needs watering during extended periods without rain. During extreme heat, increase watering frequency to keep the soil slightly moist.
Soil
Catalpa appreciates rich, well-draining, and deep soil. It adapts to various soil types, from neutral terrain to slightly acidic soils. Enrich the planting hole with compost or potting soil to promote growth.
Pruning and Training
Pruning is not essential. Perform it after flowering to maintain a balanced shape and remove dead or poorly oriented branches. Also remove any suckers that may appear at the base. Young trees can be lightly disciplined in their first years.
Fertilizer
An annual application of well-decomposed compost in spring is generally sufficient. Avoid excess nitrogen fertilizer as it would promote vigor at the expense of flowering. A balanced fertilizer in spring suits established trees.
Diseases and Pests
Catalpa is generally robust and not very susceptible to diseases. In humid conditions, monitor for leaf spots. Catalpa beetles may occasionally affect the foliage but rarely seriously. Promote good air circulation and hygiene around the tree.
Did you know?
Catalpa bignonioides owes its common name 'Northern Catalpa' to its characteristic fruits: long, thin, cylindrical pods (15 to 50 cm), resembling giant beans, which persist on the tree long after the leaves fall. Formerly planted massively throughout Europe as an ornamental and shade tree in the 18th and 19th centuries, it was also valued for its lightweight wood. Its white or pink flowers, generously sprinkled with yellow and purple dots, attract bees and pollinators in the height of summer.
Where to buy it
Best planted in autumn so the roots settle in before summer, or in early spring once the frost has passed. Pick a plant with healthy foliage and roots that are not exposed. Best time: March, October, November.
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Tips generated and checked by Viridia — adapt them to your local climate.