Plant Profile: Catalpa speciosa

Catalpa speciosa, commonly known as Northern Catalpa, is a medium to large deciduous tree celebrated for its striking white flowers adorned with vibrant yellow stamens and purple markings on the interior. These blossoms typically emerge from late spring to early summer. The tree's foliage is characterized by its impressive size, featuring elongated, eye-catching green seed pods that resemble bean capsules. The leaves, which can grow up to a foot long, are broad and ovate in shape, transforming into a brilliant yellow in the fall before eventually darkening to black. The Northern Catalpa boasts a rounded crown with spreading branches, coarse leaves, and brittle wood.

This species is indigenous to the southern regions of North America, particularly around Tennessee, Arkansas, Missouri, and parts of southern Indiana and Illinois. It thrives in full sun or partial shade and is adaptable to various soil types, although it prefers moist loam enriched with organic matter. The tree is well-suited for challenging landscape conditions, such as damp low areas or dry spots with poor soil.

The name "Catalpa" originates from the Muscogee Native American term "kutuhlpa," while the species name "speciosa" translates to 'showy.' This tree represents the northernmost member of its tropical family, Bignoniaceae, in the Americas. It is more resilient than the Southern Catalpa (Catalpa bignonioides), which flowers later, has smaller blooms, and produces thinner-walled capsules. Both species are commonly referred to as Cigartree and Indian-bean due to their unique fruits.

In terms of pests and diseases, the Northern Catalpa, like other members of its genus, generally faces few serious threats. However, it may be vulnerable to issues such as verticillium wilt, leaf spot, mildew, and twig blight. Additionally, the larvae of the catalpa sphinx moth can feed on its leaves, potentially causing significant damage.