The central stem is light to medium green, terete or angular, and glabrous to sparsely hairy. Longer lived than the Cardinal Flower, it also attracts hummingbirds. Excellent for damp clay soil.

The flowering season of great blue lobelia is from late summer to mid autumn. Annual lobelia (Lobelia erinus), grown as a perennial in the warm climates of U.S. Department of Agriculture plant hardiness zones 9 through 10, is a bushy, low-growing plant often used in flower beds and hanging baskets. Because plants are short-lived some reseeding is desirable. Most perennial lobelias, including the great blue (Lobelia siphilitica), cardinal flower (L. cardinalis) and their related cultivars maintain an above-ground basal rosette of leaves throughout the winter.
Planted together, the two Lobelias offer a stunning color combination. Should I Prune My Lobelia? Quite an architectural plant which adds vertical interest to the landscape! Also known as the great lobelia or the great blue lobelia, the Lobelia siphilitica is a North American native upright and popular perennial.

Great Blue Lobelia L. siphilitica. A North American native that is perfect for the late summer garden, Lobelia siphilitica (Great Blue Lobelia) is a popular, upright perennial which produces long-lasting spikes of bright blue flowers atop a finely-toothed, lance-shaped foliage from late summer to mid fall. Attractive, dark-green to reddish bronze leaves and showy, 3-5' spikes of brilliant red or blue flowers that bloom from late summer to early fall. It is erect and usually remains unbranched. Blue Lobelia with Cardinal Flower in the background . There are few blues more intense and gorgeous than those found on annual lobelia. Bloom Time: August through September. Height: 2 to 3 feet. Longer lived than the Cardinal Flower, it also attracts hummingbirds.
Giant Blue Lobelia: USDA Zone: 4-9: Plant number: 1.328.500. Great Blue Lobelia Lobelia siphilitica Bellflower family (Campanulaceae) Description: This perennial plant is 1-4' tall. Sometimes called "blue cardinal flower", great blue lobelia resembles red cardinal flower, (Lobelia cardinalis), in stature, habitat, and structure.

Blue Lobelia with Cardinal Flower in the background . A very pretty, easy to grow plant.

Covered in deep blue flowers in late summer and early fall, Great Blue Lobelia can form colonies of flowered spikes in medium to wet soils, especially with a little shade. This makes it a very useful plant for colour later in summer when other flowers have died off these lovely Lobelia flowers will bring a touch of color to a garden just before fall / autumn.

Prairie Nursery's Lobelia siphilitica can form colonies of flowered spikes in medium to wet soils, especially with a little shade. Lobelia siphilitica. Often seen along woodland paths. Both of these plants are tall wetland species with colorful flowers borne on terminal racemes. How to Take Care of Great Blue Lobelia Due to the conspicuous bright blue flowers, great blue lobelia is very widely used for landscaping. Great Blue Lobelia Lobelia siphilitica Bellflower family (Campanulaceae) Description: This perennial plant is 1-4' tall. Great Blue Lobelia lives longer lived than the Cardinal Flower; itit also attracts hummingbirds and is excellent for damp clay soil. Lobelia, marked by intense colors and masses of small, tubular blooms, provides interest to the garden all summer. Neutral: On Jan 17, 2005, JodyC from Palmyra, IL (Zone …

It attracts several bee species, including digger, yellow-faced, green sweat, small carpenter, and bumble bees.

Great Blue Lobelia has deep blue flowers in late summer for 3 to 4 weeks. It is erect and usually remains unbranched. Beautiful along a stream or beside a pond. Lobelia, marked by intense colors and masses of small, tubular blooms, provides interest to the garden all summer.

Keep reading to find out how and when to prune lobelia plants.

Plants enter a state of dormancy as weather grows cooler, indicated … Planted together, the two Lobelias offer a stunning color combination. Lobelia siphilitica It is a late summer treat to see great blue lobelia in full bloom, often alongside the fabulously red cardinal flower. This beautiful wetland plant adds a bright splash of blue during the late summer days, and attracts hummingbirds, bees, butterflies, and other nectar-seeking insects.

They are mostly found in moist and wet soil as short living perennials. Blue lobelia (Lobelia siphilitica) features tall flower spikes and bushy foliage, often growing to 3 feet tall with proper planting and care. Blooms in August - September in my garden. Lobelia, Great Blue . Annual lobelia is in its glory during the cool weather of spring and fall. The Great Blue Lobelia doesn’t require much space, as it will send stalks vertically. Lobelia Plants.