Catalpa

Catalpa bignonioides

Engels: Indian Bean Tree

treeBignoniaceae

Catalpa (Catalpa bignonioides) is a tree from the Bignoniaceae family that grows up to 15 meters tall. This plant thrives in full sun and requires low maintenance. Blooms in summer with white flowers and attracts bees.

Hoogte

800–1500 cm

Breedte

600–1200 cm

Zonligging

full sun

Waterbehoefte

moderate

Grondsoort

loam, clay soil

Onderhoud

low maintenance

Bloeitijd

summer

Bloemkleuren

white

Ecologische waarde

Trekt bijen aan

Verzorgingskalender

Taak	Jan	Feb	Mrt	Apr	Mei	Jun	Jul	Aug	Sep	Okt	Nov	Dec
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Care tips

Planting

The Indian bean tree thrives in full sun and tolerates a wide range of soils, though it performs best in loam or clay that retains some moisture. Choose a spacious site: mature specimens reach 8–15 metres tall with a broad, spreading crown 6–12 metres across, so plant at least 8 metres from buildings, boundaries, and other large trees. Avoid exposed, windy positions, as the large leaves are prone to wind damage. Plant bare-root or container-grown trees between October and November or in March, outside periods of frost or waterlogged ground. Autumn planting is generally preferable, allowing roots to establish before the growing season. Dig a hole twice the width of the root ball but no deeper; the root flare should sit level with the surrounding soil. Break up compacted soil at the base and sides of the hole to encourage root spread. If your soil is heavy clay, fork in some well-rotted organic matter to improve drainage slightly, though catalpas tolerate clay well. Position the tree in the hole, backfill with the excavated soil, and firm gently with your heel to eliminate air pockets. Water thoroughly after planting—at least two full watering cans—to settle the soil around the roots. Apply a 7–10 cm layer of organic mulch (chipped bark or well-rotted compost) around the base, keeping it clear of the trunk itself to prevent rot. Stake young trees with a single angled stake and a flexible tie for the first two years if the site is exposed, but catalpas generally establish well without staking in sheltered gardens.

Pruning

Prune your Indian bean tree during dormancy between November and February, ideally in late winter just before growth resumes. Pruning at this time minimises sap bleeding and allows you to see the branch structure clearly. Catalpas require very little routine pruning once established; they naturally develop a broad, rounded crown without much intervention. Use sharp bypass secateurs for stems up to 2 cm diameter, loppers for branches up to 5 cm, and a pruning saw for anything larger. Always cut just above an outward-facing bud or back to a main branch, avoiding stubs that invite disease. Focus on removing dead, damaged, or diseased wood first. Then take out any branches that cross or rub against each other, as wounds from friction can become entry points for infection. If two branches compete for the same space, remove the weaker or more awkwardly angled one. Young trees benefit from formative pruning in their first three to five years: select a strong central leader and remove lower side branches gradually to raise the crown to your desired height, typically 2–2.5 metres for clearance beneath. Remove no more than one-third of the crown in any single year. Mature catalpas rarely need pruning beyond the removal of dead wood, though you can reduce overlong or wayward branches to maintain shape if necessary. Avoid heavy pruning, as catalpas respond with vigorous, weakly attached regrowth. If a large branch must be removed, make the cut just outside the branch collar to promote proper healing.

Maintenance

Indian bean trees are low-maintenance once established. Water newly planted trees regularly during their first two growing seasons, especially in dry spells between April and September—aim for a thorough soak every 7–10 days rather than frequent light watering, which encourages shallow roots. Established trees tolerate moderate drought but perform best with consistent moisture; water during prolonged dry periods in summer to prevent leaf scorch on the large foliage. Feed in March and April with a general-purpose granular fertiliser (such as Growmore or blood, fish, and bone) scattered around the root zone and watered in. A single spring application is sufficient; avoid high-nitrogen feeds later in the season, which promote soft growth vulnerable to frost. Refresh the mulch layer each spring to suppress weeds, conserve moisture, and gradually improve soil structure as it breaks down. Catalpas are fully hardy across temperate Europe (zone 5a–9b) and require no winter protection. The large, heart-shaped leaves emerge late—often not until May—and drop early in autumn, sometimes after the first frost. This is normal; don't mistake late leafing for winter damage. Pests and diseases are rarely serious. Catalpas can suffer from powdery mildew in humid summers, causing a white coating on leaves; this is largely cosmetic and doesn't warrant treatment. Verticillium wilt occasionally affects catalpas, causing branch dieback; prune out affected wood promptly and sterilise tools between cuts. Aphids may cluster on young shoots in spring but seldom require intervention. The long, bean-like seed pods persist through winter and can be left on the tree or cleared up as preferred—they're harmless but numerous.