The illustrated growing guide
Northern Catalpa
Catalpa speciosa
Family Bignoniaceae
Est. zones 4-8
A dramatic, fast native shade tree — dinner-plate leaves, early-summer clusters of orchid-like white blooms for bees and hummingbirds, and long dangling bean pods. Bombproof in wet or dry, hot or cold, poor soil. It's coarse and a bit messy (dropping blooms, big leaves, and pods), so give it room as a bold specimen. Bonus lore: its caterpillars are legendary catfish bait.
Full Sun
Low water
Fast growth
Native to North America
Attracts hummingbirds
Attracts butterflies
Attracts bees
From the print shop
The closest print we make
We don’t print Catalpa speciosa. The closest we have is Catalpa bignonioides (“Catalpa”) in the Flowering Trees collection — the same genus, Catalpa, not the same species.
16 designsfrom $21.99white or black groundmatte poster, unframed
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Overview
Will northern catalpa suit your garden, and what goes wrong.
Will it fruit where you are?
Enter your ZIP — we look up your USDA hardiness zone (2023 map) and check it against what northern catalpa actually needs.
Hardy inZones 4-8Northern Catalpa at a glance
Common northern catalpa problems
- Catalpa Sphinx (the 'catalpa worm' — defoliates but the tree recovers; anglers harvest them)
- Almost none serious
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Growing
Light, water, soil, propagation and the season’s jobs.
How to grow northern catalpa: light, water & soil
How to plant & propagate northern catalpa
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The year
What northern catalpa asks for, month by month.
The northern catalpa year, month by month
BloomPruneWhat each band means
- Bloom — flowers open — pollinators working, frost on blossoms is the danger.
- Prune — shape it now — cuts heal cleanly and structure is visible.
The northern catalpa year as text
- Jan pruning
- Feb pruning
- Mar quiet month
- Apr quiet month
- May bloom
- Jun bloom
- Jul quiet month
- Aug quiet month
- Sep quiet month
- Oct quiet month
- Nov quiet month
- Dec pruning
These are the species' typical months — expect them a few weeks earlier in warm zones and later in cold ones. Watch the plant, not just the calendar.
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Ecology & uses
What it does for the garden, and what it is grown for.
Northern Catalpa in the garden system
- Canopy layer tree
- Nectary/insectary
- Hosts Catalpa sphinx moth (famous catfish bait)
What northern catalpa is grown for
! Some parts toxic — see notesPods/seeds not for eating; foliage safe
Harvesting & storing northern catalpa
Long bean-like seed pods (ornamental, not edible).
Edibility, identification, and traditional-use notes here are general reference — not medical or veterinary advice, and not a claim that any plant treats or prevents anything. Medicinal ratings record how strongly a plant features in herbal tradition, nothing more. Never eat or dose a plant you have not positively identified. More on how to use this library.
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Cultivars
Named varieties of northern catalpa, ruled as a catalogue.
Best northern catalpa varieties & cultivars
Northern C. speciosa (hardier, better form); Southern C. bignonioides ('Nana' = dwarf umbrella catalpa)
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Sources & plant ID
Where the care distinctions come from, and how the plant is filed.
Research basis
Sources behind this profile
No extension citations are attached to northern catalpayet. The care figures below come from the library's own catalogue rather than a traced primary source.
Plant ID
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Where to buy
Third-party nurseries — not Story Thyme Farms.
Third-party nurseries, not Story Thyme Farms. Prices are theirs.
Story Thyme Farms may earn a small commission from these links, at no cost to you — it never changes what we recommend.
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Questions
Northern Catalpa questions, answered straight.
Is northern catalpa safe for kids and pets?
With care. Pods/seeds not for eating; foliage safe Site it accordingly if children or pets roam the garden. This is general reference, not medical or veterinary advice — call a vet or poison control if something has actually been eaten.
When do you harvest northern catalpa?
Long bean-like seed pods (ornamental, not edible).
How do you propagate northern catalpa?
Seed (stratify), cuttings, or layering.
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Elsewhere
Where northern catalpa sits in the library.
Black Locust
Sassafras
Eastern Hemlock
American Sycamore