Repotting guide

When & how to repot Catalpa bignonioides 'Aurea' (Catalpa bignonioides 'Aurea')

Also called Golden Indian Bean Tree.

More about catalpa bignonioides 'aurea'

About Catalpa bignonioides 'Aurea'

Catalpa bignonioides 'Aurea' · also called Golden Indian Bean Tree · flowering

The golden-leaved form of the Southern catalpa, 'Aurea' unfurls velvety bronze-purple young leaves that mature to soft butter-yellow, holding the colour best in good light. Large heart-shaped foliage and, on mature specimens, white summer flower panicles make it a striking specimen. Often hard-pruned as a pollard to produce oversized leaves on a compact, brightly coloured frame.

Mature size: 8-12 m tall and wide if left unpruned; pollarded specimens are commonly held to 2-4 m. Fast-growing, especially after hard pruning.

How to tell catalpa bignonioides 'aurea' needs repotting

Repotting on a calendar is less reliable than reading the plant. For catalpa bignonioides 'aurea', watch for these signs:

Thick roots out of the drainage holes, or circling the surface and lifting the plant.
The pot dries out unusually fast and catalpa bignonioides 'aurea' wilts between waterings it used to shrug off.
The plant is visibly top-heavy and tips over easily.
Stalled growth and small new leaves over a full season — though with a big specimen, top-dressing is often the better first response before a full repot.

For the underlying biology of a pot-bound root system and why it stalls a plant, see our guide to spotting and fixing a root-bound plant.

How often to repot catalpa bignonioides 'aurea'

Every 2–3 years; top-dress in the in-between years. Catalpa bignonioides 'Aurea''s growth habit — broad, rounded deciduous tree, frequently kept as a pollard or coppiced shrub for a compact, dome of large bright leaves on a strong framework. — sets the pace. The golden-leaved form of the Southern catalpa, 'Aurea' unfurls velvety bronze-purple young leaves that mature to soft butter-yellow, holding the colour best in good light. Large heart-shaped foliage and, on mature specimens, white summer flower panicles make it a striking specimen. Often hard-pruned as a pollard to produce oversized leaves on a compact, brightly coloured frame.

What size pot to step catalpa bignonioides 'aurea' up to

Move up exactly one pot size. A heavy catalpa bignonioides 'aurea' dropped into a vastly bigger pot sits in a reservoir of wet soil its roots cannot reach, which rots them and destabilises the plant. In the years between repots, lift off and replace the top 3–5 cm of soil (top-dressing) instead — it refreshes nutrients without the shock of a full repot.

Not sure of the exact diameter? Our pot size calculator takes the current pot and root spread and tells you the right next size — it deliberately recommends a single step up, never a big jump.

The best time of year to repot catalpa bignonioides 'aurea'

Early spring, just as new growth restarts, is the ideal window for catalpa bignonioides 'aurea'. The plant is moving into its strongest growth phase and re-roots into fresh soil quickly. Avoid repotting in winter dormancy or, for flowering plants, while it is in bud or bloom — recovery is slowest then and you risk dropping the flowers.

Step-by-step: repotting catalpa bignonioides 'aurea'

Consider top-dressing first. If catalpa bignonioides 'aurea' is not badly root-bound, scrape off and replace the top 3–5 cm of soil instead — far less shock for a big plant that hates moving.
Get help and one size up. For a full repot, choose a pot just one size larger. A heavy plant needs two people and a stable, free-draining pot.
Ease it out on its side. Lay the plant down, slide the pot off, and gently loosen the outer roots. Do not bare-root a mature specimen.
Repot at the same depth. Add fresh deep, fertile, moist but well-drained; adaptable beneath and around the rootball, keeping the original soil line. Firm it so the trunk is stable and upright.
Water and leave it put. Water thoroughly, then leave catalpa bignonioides 'aurea' in the same spot and light — moving and repotting at once is what makes it drop leaves.

Aftercare

Leave catalpa bignonioides 'aurea' in exactly the same spot and light it was in before — moving and repotting at the same time is what makes a big specimen drop leaves. Water it in well, then let the top of the soil dry before watering again so the larger volume of fresh soil does not stay sodden. Do not fertilise for about 4 weeks — fresh mix already carries nutrients and feeding freshly disturbed roots scorches them.

The right soil mix for catalpa bignonioides 'aurea'

Catalpa bignonioides 'Aurea' wants deep, fertile, moist but well-drained; adaptable. Like the species it grows in most reasonable soils, including clay and chalk with adequate drainage, and tolerates urban sites. Rich, moisture-retentive loam gives the lushest leaf colour. Avoid waterlogging. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting catalpa bignonioides 'aurea' — frequently asked questions

How often should you repot catalpa bignonioides 'aurea'?

Every 2–3 years; top-dress in the in-between years for catalpa bignonioides 'aurea'. Fully repot catalpa bignonioides 'aurea' only every 2–3 years; in the in-between years just top-dress the top 3–5 cm of soil. Step up one pot size in spring with deep, fertile, moist but well-drained; adaptable. It is heavy and hates being moved, and a vastly oversized pot holds water against the roots and rots them.

What size pot does catalpa bignonioides 'aurea' need?

When is the best time of year to repot catalpa bignonioides 'aurea'?

Should you top-dress or fully repot catalpa bignonioides 'aurea'?

For a big, heavy catalpa bignonioides 'aurea', top-dressing — replacing the top 3–5 cm of soil — is the gentler option most years, with a full repot only every 2–3 years. A mature specimen sulks and drops leaves when fully repotted, so do it as rarely as the roots allow.

Should you fertilise catalpa bignonioides 'aurea' after repotting?

Not immediately. Wait about 4 weeks after repotting catalpa bignonioides 'aurea'. Fresh mix already contains nutrients, and feeding freshly cut or disturbed roots burns them. Resume your normal feeding routine once you see new growth.