Blue Lobelia - Lobelia siphilitica

The Blue Lobelia flowers in late summer to mid-autumn by producing a raceme of adorable, blueish, two-lipped flowers. The inflorescence rises tall above its finely toothed, wavey-edged foliage that persists along a rigid stalk. They can reach heights of 2-3 ft tall and form clumps that eventually spread throughout the growing area.

Their flowers are long lasting. With their emergence in late summer and early fall, they are not only an important food source for pollinators, but they provide a floral display long after the spring time flowering perennials have died back, rounding out the season for your garden.

Plant Details - Blue Lobelia

Family: Campanulaceae

Hardiness Zones: 4 to 9

Light Requirement: Full sun to partial shade

Water Needs: High

Height: 2 to 4 ft

Spread: 1 to 1.5 ft

Growth Rate: Moderate

Bloom Time: Mid-summer to early fall

Flower Color: Light to dark blue

Wildlife Value: Attractive to pollinators

This delightful perennial is native to Eastern North America and grows in meadows or low wooded areas. They naturally grow in areas with consistently wet soil such as springs, streams and swamps. In the garden, these water loving plants are ideal in moist locations of the yard that receive a little bit of afternoon shade. The Blue Lobelia is known for its medicinal properties. Native Americans used this plant to treat nose bleed, cough and headache. It was even used to treat symptoms of syphilis, from which it was given its Latin name of “siphilitica”.

Landscape Uses and Maintenance - Blue Lobelia

These perennials are pest and disease-free, deer resistant, and easy to grow, requiring little to no maintenance. They prefer moist to wet soils with rich humus. To encourage more flower production, deadhead this plant once the flower spike is finished. To make the plant more compact, trim back the plant after flowering. This plant also appreciates a light mulch in autumn. Plant these charming perennials in areas of full sun that receive some afternoon shade, however they will grow quite well in part shaded. It loves to have its feet wet and can grow in water as a semi-aquatic plant. Consider planting in a rain garden or boarding a stream or pond.

Noteworthy Characteristics

Late summer – autumn flowering, attractive to pollinators, grows well in wet soil.

With its tall flowering stalk, and clump forming growth habit, this perennial will add unique layers of unique texture and vibrant color to your garden to keep you looking forward to their late summer flowering season. Shop for Blue Lobelia plants online at TN Nursery. For 68 years, we have served the landscaping industry and homeowners with specimen plants.

This Is How Your Plants Will Look upon Delivery

Bloom Season

Summer

Bloom/Foliage Color

Blue

Height at Maturity

Over 12"

Care

Blue Lobelia thrives in well-drained, consistently moist soil. Regularly water to moisten the soil, especially during hot, dry periods. Fertilize lightly in early spring, and remove spent flowers to encourage continuous blooming—mulch to retain moisture and suppress weeds.

Plant Reproduction

Blue Lobelia spreads by reseeding, dividing clumps, or taking cuttings.

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