Catalpa
Also known as: Cigar Tree · Indian Bean Tree · Catalpa
4 types of catalpa
Chinese Catalpa
N/Aalso: Catalpa ovata, Yellow Catalpa
Yellow-flowered catalpa with a more compact habit.
Manchurian Catalpa
N/Aalso: Catalpa bungei
Narrower crown and smaller leaves; hardy catalpa from northern China.
Northern Catalpa
N/Aalso: Catalpa speciosa, Catawba Tree, Hardy Catalpa, Northern Cigar Tree, Western Catalpa
Large hardy catalpa with showy white flowers; popular shade and timber tree.
Southern Catalpa
N/Aalso: Catalpa bignonioides, Cigar Tree
Native southeastern U.S. tree with white flowers marked purple and yellow.
When & where
Germination
Spacing & depth
How to plant
Stratify seed as noted. Sow in deep tree pots filled with well-drained mix. Keep evenly moist and in bright light after germination. Grow on for 1–2 seasons before planting out.
Pre-sow treatment
30–60 days cold stratification; surface-sow, needs light.
Grower's tip
Large-leaved deciduous trees with showy orchid-like flowers and long bean-like seed pods.
Soil preferences
Deep, well-drained native soil. Avoid amending the planting hole heavily — roots should learn to grow into the surrounding earth.
5.5–7.5 depending on species (conifers lean acidic; most hardwoods neutral).
Top-dress with compost and mulch in a wide ring; don't backfill with pure compost.
Watering
Deep soak weekly the first two years while roots establish; taper once the tree self-supports.
Slow trickle at the drip line, not the trunk. A 5-gal bucket with a pinhole is ideal.
Overwatered: yellowing, root rot, mushroom collar. Underwatered: leaf scorch, early leaf drop.
Prefers top-watering — Top-water at the base with drip. Rust and anthracnose spread through wet leaves — never work in a bean patch when it's wet.
Temperature tolerance
Broad — most species tolerate 40–90°F once established
Down to species-rated USDA zone minimum
Hardy once established; young seedlings need protection their first winter.
Special germination requirements
Most temperate tree seed needs cold stratification (30–120+ days at 34–41°F) — see each species entry for the exact time.
Container growing
Possible with the right cultivar
Deep tree pots (root trainers) for the first 1–2 seasons; permanent site required for full growth.
Only dwarf, patio, or bonsai forms live long-term in containers.
Detailed harvesting
Not applicable for ornamental/timber trees. Nut and fruit species — pick when they drop naturally.
Post-harvest storage & preservation
Nuts: keep damp and cool, sow promptly. Winged/coned seed: dry, cool, dark in a sealed jar.
Culinary, medicinal & other uses
Shade, windbreak, wildlife habitat, timber, ornament, and long-term carbon storage.
Medicinal or traditional uses are shared for interest only — this is not medical advice. Consult a qualified professional before using any plant medicinally.
Seed saving
Wind- or insect-pollinated; seedlings rarely match the parent exactly (especially named cultivars — those must be grafted or cutting-grown).
Not practical for trees. Expect variation.
Collect fully ripe seed in fall, clean, dry or keep damp per species, then cold-stratify before spring sowing.
Your zone's planting calendar
Pick your USDA hardiness zone and we'll estimate the key dates for catalpa in your area. These are regional averages — always check your own last-frost forecast before sowing.
From your kitchen — grow catalpa from what you already have
Trees usually mean patience — collect fully ripe seed in fall, clean pulp off, and give most species a cold winter (real or in the fridge) before they'll germinate.
- 1Collect ripe seed/nuts/cones in autumn from a healthy parent.
- 2Clean off any fleshy pulp; dry cones warm to release seed.
- 3Cold-stratify in a bag of damp sand or peat in the fridge (34–41°F) for the time listed on the species.
- 4Sow in deep tree pots and grow on 1–2 seasons before planting to a permanent spot.
Storage: Most tree seed keeps 1–3 years cool and dry; oak/hickory/chestnut nuts must stay damp and be sown promptly.
My Catalpa notes
Catalpa seeds on hand
Track packets and loose seeds you already have. Private to your account.
Par level — leave at 0 for no alert. Anything below par shows on Seed Starting and your shopping list.
Order more seeds
Running low? Reorder from one of these seed stores.
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