Plants diurnal

northern catalpa

Catalpa speciosa

A towering giant with heart-shaped leaves and orchid-like blooms, the northern catalpa is a spectacular centerpiece for any backyard ecosystem. Known for its 'cigar' seed pods and its role as a host for the unique Catalpa Sphinx moth, this tree is a skyscraper of life.

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Quick Identification

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Size

Grows 15–30 meters (50–100 feet) tall with a canopy spread of 6–12 meters (20–40 feet). Trunk diameter can reach 1 meter (3 feet).

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Colors

Bright green leaves; showy white flowers with internal purple streaks and yellow spots; dark brown seed pods; grayish-brown furrowed bark.

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Key Features

Extra-large heart-shaped leaves (up to 12 inches long)
Showy clusters of white orchid-like flowers in late spring
Long, pendulous, cigar-shaped seed pods
Coarse, scaly bark on mature specimens

When You’ll See Them

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Activity pattern diurnal

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Peak hours 6 AM - 8 PM for flowering activity; nocturnal for moth pollination

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Season May-June (blooming); September-January (seed pods)

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Diet As a primary producer, it creates its own energy through photosynthesis, requiring full sun and consistent moisture to reach its maximum growth rate.

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Habitat Found in suburban yards, parks, and along riverbanks; it thrives in moist, well-drained soils but is highly tolerant of urban pollution and compacted soil.

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Behavior

The northern catalpa is a fast-growing, charismatic deciduous tree that acts as a central hub for backyard biodiversity. While it appears stationary, it is a hive of activity during its blooming period in late May and June. The tree uses its large, fragrant flowers to attract a wide variety of pollinators, specifically bees and hummingbirds during the day, and various moth species at night. Its massive leaves provide dense shade, making it a preferred nesting site for birds seeking protection from the summer sun.

One of the most fascinating aspects of northern catalpa behavior is its relationship with the Catalpa Sphinx moth. The tree is the sole host for these caterpillars, which can sometimes defoliate portions of the tree. In response, the tree releases volatile chemicals to attract predatory wasps that hunt the caterpillars, showing a sophisticated level of environmental interaction. In winter, the tree retains its long, bean-like seed pods, which rattle in the wind and provide a persistent food source for foraging wildlife when other resources are scarce.

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Camera Tips

To capture the true beauty of a northern catalpa on your trail camera, timing is everything. During the late spring bloom (typically late May), mount your camera on a ladder or a nearby structure to reach a height of 8 to 10 feet. Angle the lens downward toward the lower blossom clusters. This positioning allows you to capture the high-speed visits of hummingbirds and bumblebees that are drawn to the nectar-rich flowers. Use a high shutter speed or 'burst mode' to freeze the action of these fast-moving pollinators.

For those interested in the 'micro-wildlife' of the catalpa, position a camera with macro capabilities or a close-focus lens near the trunk or lower branches during mid-summer. This is the best way to document the striking black-and-yellow Catalpa Sphinx caterpillars. If you place your camera facing a section of the trunk with deeply furrowed bark, you may also capture the emergence of the adult moths or the movement of nuthatches and creepers searching the bark crevices for insects.

In the winter months, the northern catalpa's 'cigar' pods become the main attraction. Place your camera on a post or tripod about 5 feet away from a low-hanging branch laden with pods. This is an excellent way to capture squirrels and winter birds like Northern Cardinals or Blue Jays as they attempt to break into the pods. Because the tree is stationary, you can set your camera's trigger sensitivity to 'Medium' to avoid triggers from the wind, but keep the video duration long (15-20 seconds) to observe the animals' foraging techniques.

Finally, don't forget the night shift. The northern catalpa’s flowers are highly fragrant at night to attract hawkmoths. If your camera has a high-quality infrared flash, keep it active during the blooming season. Positioning the camera to look through a cluster of flowers against a dark background can produce ethereal, glowing images of night-visiting insects that many backyard observers never get to see.

Similar Species

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

Southern Catalpa

Smaller in overall size with more numerous purple spots inside the flowers and thinner-walled seed pods.

Royal Paulownia

Often mistaken due to similar leaf shape, but it produces upright purple flowers in early spring and oval nut-like seed capsules instead of long pods.

Frequently Asked Questions

The flowers are active 24 hours a day during their short blooming window in late spring, attracting bees and hummingbirds during the day and fragrant-loving moths at night.

The tree itself is the attractant! Keep the soil around the base mulched and avoid using pesticides, which allows the Catalpa Sphinx moth caterpillars to thrive, which in turn attracts birds and predatory wasps.

They are plants that produce their own food via photosynthesis. They grow best in full sun and appreciate deep, occasional watering during summer droughts.

Yes, they are popular ornamental trees in suburban areas due to their fast growth, beautiful flowers, and ability to thrive in various soil conditions.

Northern catalpa has larger leaves that end in a sharp point and flowers that are mostly white with fewer purple spots. Its seed pods also have thicker walls compared to the southern variety.

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