Trees diurnal

southern catalpa

Catalpa bignonioides

A Southeastern icon known for its massive heart-shaped leaves and showy white blossoms, the Southern Catalpa is a 'living hotel' for pollinators and birds alike. Often called the 'Cigar Tree' for its long seed pods, it offers a year-round spectacle of growth and wildlife activity.

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Quick Identification

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Size

30-60 feet (9-18 meters) tall with a canopy spread of 20-40 feet (6-12 meters)

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Colors

Large bright-green foliage, showy white flowers with yellow and purple interior streaks, and long dark-brown seed pods.

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Key Features

Large heart-shaped leaves up to 12 inches long
Showy clusters of white, orchid-like flowers in late spring
Long, pendulous 'cigar' seed pods that persist through winter
Rough, scaly grey-brown bark on mature trunks

When You’ll See Them

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Activity pattern diurnal

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Peak hours 7 AM - 11 AM (flower visitors); Late evening (sphinx moths)

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Season May-June (blooming); August (caterpillars); Year-round (bark and seed pods)

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Diet Produces energy through photosynthesis; requires full sun and moist, nutrient-rich soil to thrive.

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Habitat Suburban lawns, riverbanks, forest edges, and open meadows throughout the Southeastern United States.

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Behavior

The Southern Catalpa is a fast-growing deciduous tree that serves as a central hub for backyard biodiversity. In late spring and early summer, it transforms into a visual masterpiece, covered in large panicles of white flowers that emit a subtle, sweet fragrance. These blooms are highly attractive to pollinators, particularly large bees and hummingbirds during the day, and various sphinx moths at night.

Ecologically, the tree is most famous for its relationship with the Catalpa Sphinx Moth. It is the sole host plant for the moth's larvae, known as 'catalpa worms.' While these caterpillars can occasionally strip the tree of its leaves, the tree is remarkably resilient and usually pushes out a second flush of foliage. This cycle creates a massive food source for insectivorous birds, making the tree one of the best locations in a suburban yard to observe predator-prey interactions.

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Camera Tips

To capture the full glory of a Southern Catalpa, set up your camera for a long-term time-lapse. Position the camera on a tripod or fence post approximately 15-20 feet away from the canopy. Starting in early spring, a single photo taken every day at noon will document the dramatic transition from bare branches to massive heart-shaped leaves and the 'snow-covered' effect of the late-spring bloom.

For wildlife enthusiasts, the 'caterpillar phase' in mid-to-late summer is the prime time for action shots. Aim your camera at the lower branches where the leaves are largest. Use a high-sensitivity PIR setting and a short trigger interval, as birds like Cuckoos, Orioles, and Flycatchers will dart in quickly to pluck catalpa worms from the undersides of the leaves. If your camera has a 'near-focus' or macro lens adapter, focus on a specific cluster of leaves to capture the intricate patterns of the sphinx moth larvae.

Don't forget the nocturnal visitors! Because the flowers are designed to attract moths, setting your camera to 'Hybrid Mode' (photo followed by video) with an infrared flash will help you identify the various sphinx moths that hover like hummingbirds in front of the white blossoms after dark. Place the camera 4-6 feet away from a low-hanging flower cluster for the best detail.

In the winter, the Southern Catalpa's long seed pods and furrowed bark become the main attraction. Angle your camera slightly upward along the main trunk to capture nuthatches, brown creepers, and woodpeckers foraging for insects tucked into the bark scales. The 'cigar' pods often stay on the tree through the wind and snow, providing excellent architectural interest for winter backyard photography.

Similar Species

Species that look similar or are commonly confused with southern catalpa.

Northern Catalpa

Larger flowers with fewer purple spots and thicker-walled seed pods; typically a taller, more upright tree.

Royal Paulownia

Often mistaken for Catalpa due to large leaves, but produces purple upright flower clusters and egg-shaped seed capsules rather than long pods.

Frequently Asked Questions

You will see the most activity in the morning between 7 AM and 11 AM when bees and hummingbirds visit the flowers. However, nocturnal moths are very active around the blooms just after sunset and through the night.

Southern Catalpa is best grown from saplings or seeds planted in a sunny spot with moist, well-drained soil. It grows very quickly, often providing significant shade within just 5 to 7 years.

As a plant, the Southern Catalpa creates its own food using sunlight via photosynthesis. It requires consistent moisture and benefits from organic mulch around the base to retain soil nutrients.

Yes, they are very common in suburban areas across the South and Midwest as ornamental shade trees, though they are often chosen for larger yards due to their wide canopy and falling seed pods.

Southern Catalpa (C. bignonioides) generally has slightly smaller flowers and narrower seed pods compared to the Northern Catalpa (C. speciosa). Additionally, when crushed, Southern Catalpa leaves have a more noticeable, slightly unpleasant odor.

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