These low-growing plants come in upright or trailing forms and have green, red, or bronze foliage. Small, single flowers in shades of blue or purple trail elegantly from hanging baskets or add beauty to flower beds, borders, edgings or patio containers.
Lobelia grows best in cool areas or where cool nighttime temperatures moderate the weather. Set plants in rich, evenly moist soil in partial shade. Space plants 4-6" apart in the garden or in containers.
How to Grow
Lobelia will bloom well in partial shade and thrive if you mulch the roots in the garden or in containers. Hardy perennial lobelias need light to partial shade and constantly moist soil rich in organic matter. Plants will grow in full sun in northern gardens if the soil is kept moist. To keep the plants vigorous, dig the clumps every 2-3 years in spring and discard the old growth at the center of the clump, replanting only the new rosettes of leaves that grew around it.
Perennial lobelias are useful for difficult wet locations in full sun or partial shade. Cardinal flower is attractive in the middle or back of the perennial border. Both species naturalize well in woodlands or along stream banks. They make interesting landscape accents when planted in masses. Lobelias are also great for cutting.