How to Grow and Care for Lobelias

Edging lobelia (Lobelia erinus) is a native South African flowering plant related to the bellflower. Edging lobelia is a popular garden plant for ornamental purposes and is often cultivated in hanging baskets and planters. Edging lobelia can be damaged by frost and cold temperatures and grows best in temperate climates.

Once thought to be a cure for syphilis, the Lobelia siphilitica, or great blue lobelia, is a strikingly beautiful blue wildflower that blooms in late summer. Cascades of segmented tubular flowers sit atop tall erect stems on these showy perennials.

The cardinal flower (Lobelia cardinalis) is a perennial herbaceous plant that grows from 61 to 183 cm tall. Showy red flowers bloom spring through fall. Named for its red flowers that are similar to a Cardinal's robe, these blossoms attract hummingbirds to the garden. Its fruits are blue and foliage changes color in fall. It prefers sun to partial shade with moist soil. Perfect for wet areas.

Lawn lobelia (Lobelia angulata) is a creeping perennial herb native to New Zealand. It grows in moist, but well-drained soil under partial sun. Lawn lobelia tends to create a "carpet" of bright leaves and flowers, making it an attractive addition to many gardens.

Lobelia speciosa is a hybrid developed from three lobelia species: L. fulgens, L. cardinalis, and L. siphilitica. Lobelia speciosa flowers come in several colors, such as pink, red, or lavender. It's a popular garden plant that particularly attracts hummingbirds and butterflies.