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Choose your climateBased on winter hardiness only.

Tree · Bignoniaceae family

Southern catalpa

Catalpa bignonioides

Full sun to part shade in a garden 16 ft 4⅞ in–26 ft 3 in × 13 ft 1½ in–22 ft 11⅝ in Flowers June–July to −73 °F
Flower colors Click a color

In short a 10-second read

SunFull sun to part shade
in a garden after 10 years16 ft 4⅞ in–26 ft 3 in
in the wild up to 49.2 ft
spacing 29 ft 6⅜ in
FlowersJune–July
PlantingMarch–April, October–November
WinterNo winter protection

Where to plant and how much to water

Sun, soil and water.

It grows best in full sun to part shade, in average to moist soil.

Sun

Sun6 hours or more
Part shade3–6 hours
Shadeunder 3 h

Soil

tolerates any pH
acidicneutralalkaline
average to moistclayloamysandy

Watering

keep the soil evenly moistless when it rains

Frost

−73 °F
no winter protectionleafless in winter

How much space it takes

Mature size.

The mature plant next to a person (69 in).

3 ft 3⅜ in6 ft 6¾ in9 ft 10⅛ in13 ft 1½ in16 ft 4⅞ in19 ft 8¼ in22 ft 11⅝ in26 ft 3 in29 ft 6⅜ in32.8 ft36.1 ft39.4 ft42.7 ft45.9 ft49.2 ft29 ft 6⅜ in–49.2 ftspread 26 ft 3 in–49.2 ft
29 ft 6⅜ in–49.2 ft× spread 26 ft 3 in–49.2 ft

Plant 29 ft 6⅜ in apart.

Reaches maturity in about 20–50 years. The final size depends on the cultivar and the spot — we give the range from smallest to largest.

Calendar

Through the year.

Typical for a temperate climate (four seasons). The line shows the current month.

The year at a glance

Flowers: JanuaryFlowers: FebruaryFlowers: MarchFlowers: AprilFlowers: MayFlowers: JuneFlowers: JulyFlowers: AugustFlowers: SeptemberFlowers: OctoberFlowers: NovemberFlowers: DecemberPlanting: JanuaryPlanting: FebruaryPlanting: MarchPlanting: AprilPlanting: MayPlanting: JunePlanting: JulyPlanting: AugustPlanting: SeptemberPlanting: OctoberPlanting: NovemberPlanting: DecemberFeeding: JanuaryFeeding: FebruaryFeeding: MarchFeeding: AprilFeeding: MayFeeding: JuneFeeding: JulyFeeding: AugustFeeding: SeptemberFeeding: OctoberFeeding: NovemberFeeding: DecemberJanFebMarAprMayJunJulAugSepOctNovDec
FlowersPlantingFeeding
Now, in October: a good time for planting (container plant, bare-root, root-balled).
JanFebMarAprMayJunJulAugSepOctNovDec

Flowers

JanFebMarAprMayJunJulAugSepOctNovDec

June–July · white

Planting

JanFebMarAprMayJunJulAugSepOctNovDec

container plant: March–April, October–November; bare-root: March–April, October–November; root-balled: March–April, October–November

Feeding

JanFebMarAprMayJunJulAugSepOctNovDec

May–June

Feeding

Nutrition.

Horn meal

up to 0.18 oz/sq ft a year, if the soil needs it · May–June

JanFebMarAprMayJunJulAugSepOctNovDec

Pests and diseases

Common problems and what to do.

The most common problems in Central Europe. Protection is listed from the gentlest option.

High riskMedium riskLow riskRisk for this plant according to the source · no label = no documented level

Verticillium wilt

Verticillium
Medium riskdiseasesource covers the whole genus
More about this problem

What you will see

Leaves yellow and wilt, often on one side of the tree only. When a branch is cut, the wood is green to black or streaked. The tree usually cannot be cured.

The source says: it is among the plants affected most commonly.

When to look

Throughout the year; symptoms can develop rapidly in hot weather

How to protect

  1. Prevention
    • Do not plant susceptible species (maple, catalpa, redbud) where a tree has been killed by this disease.
    • Do not make mulch from the wood of affected trees.
    • Do not overdo feeding and pruning.
  2. By hand spring – summerWith mild symptoms, cut out affected branches, disinfect tools, water the tree and keep it vigorous. There is no reliable chemical cure.
Verticillium wiltdisease · throughout the year; symptoms can develop rapidly in hot weatherMedium risk

What you will see

Leaves yellow and wilt, often on one side of the tree only. When a branch is cut, the wood is green to black or streaked. The tree usually cannot be cured.

The source says: it is among the plants affected most commonly.

When to look

Throughout the year; symptoms can develop rapidly in hot weather

How to protect

  1. Prevention
    • Do not plant susceptible species (maple, catalpa, redbud) where a tree has been killed by this disease.
    • Do not make mulch from the wood of affected trees.
    • Do not overdo feeding and pruning.
  2. By hand spring – summerWith mild symptoms, cut out affected branches, disinfect tools, water the tree and keep it vigorous. There is no reliable chemical cure.
More about this problem
Sources (3)

Frequently asked

Quick answers.

When does southern catalpa flower?

In June–July; the flowers are white.

Does southern catalpa tolerate shade?

It tolerates part shade (3–6 hours of sun), but not full shade.

How much space does southern catalpa need?

At maturity 26 ft 3 in–49.2 ft wide and 29 ft 6⅜ in–49.2 ft tall; recommended spacing 29 ft 6⅜ in.

Verticillium wilt — what can you do?

Do not plant susceptible species (maple, catalpa, redbud) where a tree has been killed by this disease. With mild symptoms, cut out affected branches, disinfect tools, water the tree and keep it vigorous. There is no reliable chemical cure.

Sources (17) Checked 24 October 2026

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Have a look at these too.

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