Catalpa Tree

A bold, tropical-looking shade tree with enormous heart-shaped leaves, showy clusters of white orchid-like flowers, and long dangling seed pods. Catalpas are fast-growing and incredibly tough, tolerating poor soil, drought, and neglect once established. The catalpa worm, a large caterpillar that feeds on the leaves, is prized as fish bait by anglers. These trees create heavy shade with their large leaves but can be messy with dropped flowers, pods, and leaves throughout the seasons.

Catalpa seeds are easy to germinate and require no stratification. Collect dried pods in autumn and extract the flat, papery seeds. Sow seeds indoors in late winter, pressing them lightly into moist seed-starting mix and covering with a thin layer of vermiculite. Seeds germinate in 7 to 14 days at 70 to 75 degrees Fahrenheit. Transplant seedlings into individual pots when they develop their first true leaves. Catalpas can also be direct-sown outdoors in spring. Seedlings grow rapidly, often reaching 3 to 4 feet in the first year.

The Season Plate

Your Catalpa Tree Year

Composed for Zone 7 · typical seasons · frost passes Apr 2, returns Nov 1

Sow Catalpa Tree Mar – Apr, Oct – Nov, pick —. Set your climate below and every date on this plate re-times itself.

Sowing window

Mar – Apr, Oct – Nov

re-timed to your frost dates

Plant out

after Apr 2

once frost risk has passed

First picking

around Mar 14

≈ 1825 days from sowing · 200 to per plant

Composed for —ColdTemperateMildWarmUse my locationUsed once to set your season · only the zone is kept

Week-by-week Catalpa Tree reminders watering, feeding and pruning, timed to your dates

In the app

Frost alerts for your garden a warning before a cold night costs you the crop

In the app

Succession sowing dates so the picking never gaps mid-season

In the app

Prefer email? Get monthly reminders in the Almanac

Keep my dates — free for 7 daysWe nudge you as each window opens · cancel anytime

Plant catalpas in full sun in any well-drained soil. They are remarkably tolerant of poor, compacted, and alkaline soils, making them suitable for difficult sites where other trees struggle. Space trees at least 30 feet apart to accommodate their broad, spreading canopy. Plant balled-and-burlapped or container-grown specimens in spring or early fall, setting the root flare at soil level.

Water newly planted catalpas weekly during the first growing season. Once established, they are moderately drought-tolerant and thrive with minimal supplemental irrigation. Apply a 3-inch layer of organic mulch around the root zone to conserve moisture and suppress weeds. Catalpas grow rapidly, often adding 2 to 3 feet of height per year when young.

Prune in late winter to remove dead wood, crossing branches, and any low-hanging limbs that interfere with foot traffic. Catalpas have brittle wood that can break in storms, so develop a strong branching structure early by maintaining a central leader and wide-angled scaffold branches. The large leaves, flower petals, and long seed pods create significant seasonal litter, so site the tree where debris will not be a problem.

The large catalpa leaves create dense shade that limits understory options. Plant shade-tolerant groundcovers like vinca, English ivy, or wild ginger beneath the canopy. Spring-blooming bulbs work well since they complete their growth cycle before the catalpa canopy fills in. Native ferns and hostas thrive in the dappled light at the canopy edge. The fallen leaves decompose quickly and contribute to soil fertility. Avoid planting near patios or pools where the seasonal debris would be problematic.

The Society Table

Daffodil belongs beside it. Walnut Tree doesn't.

Old growers' knowledge, checked against Catalpa Tree's real companion table below — test any plant you're growing.

Grows well in the company of · 1

Daffodil

Keep apart · 1

Walnut Tree

Plant Catalpa Tree with good neighboursThe planner flags conflicts before they're in the ground

Catalpas are extremely adaptable and grow in virtually any soil type from heavy clay to sandy loam, including alkaline and compacted soils. They prefer a pH of 5.5 to 7.5 but tolerate conditions outside this range. Apply a balanced 10-10-10 fertilizer in early spring for young trees at a rate of 1 to 2 pounds per inch of trunk diameter. Mature catalpas rarely need fertilization. Excessive nitrogen promotes rank, weak growth that is more susceptible to storm damage.

Ideal Temperature

Hardiness Zone Compatibility

Catalpas are primarily ornamental and not grown for harvestable products. The long bean-like seed pods that develop after flowering can be collected in fall for propagation purposes. Allow pods to dry on the tree until they turn brown and begin to split open. Each pod contains numerous flat, winged seeds. The catalpa worms that feed on the leaves are harvested by anglers as highly effective fish bait, collected by hand or by shaking branches over a sheet.

Storage & Preservation

Catalpa seed pods should be collected when fully brown and dry in late autumn. Store whole pods in paper bags in a cool, dry location until ready to extract seeds. Cleaned seeds store well in sealed containers in the refrigerator for up to two years. Catalpa worms can be frozen for later use as fish bait by placing them in cornmeal inside a freezer bag. The wood is naturally rot-resistant and has been used for fence posts, railroad ties, and outdoor furniture.

Troubleshooting Common Problems

Catalpas are messy trees that drop large leaves, flower petals, and long seed pods throughout the growing season, making them poor choices near patios or parking areas. The brittle wood is prone to breakage in ice storms and high winds. Catalpa sphinx caterpillars can completely defoliate trees in summer, though healthy trees typically releaf. The large leaves are susceptible to tearing in strong winds, giving the tree a ragged appearance. Some municipalities restrict catalpa planting due to litter concerns.

Growing Tips

1. Plant catalpa trees in full sun for the best flower production and strongest growth. While they tolerate partial shade, trees in full sun develop denser canopies and bloom more prolifically than those growing in shaded conditions.
2. Northern catalpas thrive in a wide range of soil types but perform best in deep, moist, well-drained loam. They tolerate clay and sandy soils remarkably well and can handle both acidic and alkaline pH levels between 5.5 and 7.5.
3. Water newly planted catalpas deeply once per week during the first two growing seasons to establish a strong root system. Once established, mature trees are moderately drought-tolerant and typically need supplemental water only during extended dry spells.
4. Avoid planting catalpas near patios, pools, or driveways where the large leaves, fallen flowers, and long seed pods can create significant litter. Position them where their messy habits will not be a nuisance to daily activities.
5. Prune catalpas during late winter dormancy to shape the canopy and remove dead or crossing branches. The wood is somewhat brittle, so removing narrow-angled branch unions early in the tree's life helps prevent storm damage later.
6. If you want to attract catalpa worms for fishing bait, plant at least two or three trees to create a larger leaf mass that is more likely to attract egg-laying sphinx moths from the surrounding area.
7. Catalpas are among the last trees to leaf out in spring and among the first to drop leaves in fall, so pair them with evergreen plantings or early-leafing species to avoid a prolonged bare appearance in the landscape.
8. Propagation from seed is straightforward. Collect brown seed pods in autumn, extract the flat winged seeds, and sow them in moist potting mix in early spring. Seeds require no stratification and germinate within two to three weeks at room temperature.
9. Fertilize young catalpas annually in early spring with a balanced slow-release fertilizer such as 10-10-10 applied at the drip line. Mature trees growing in reasonably fertile soil rarely need supplemental fertilization.
10. Monitor for verticillium wilt, which can cause sudden wilting and dieback of branches. There is no chemical cure for this soil-borne fungal disease, so prevention through proper siting, good drainage, and avoiding root damage is the best strategy.