All are grown for their tubular, lipped flowers, which resemble those of honeysuckle (Lonicera) or Salvia. Annual kinds are low plants for edgings or hanging baskets; perennial sorts are larger, vertical-growing plants with flowering stalks that rise above the foliage.Lobelia cardinalis
This perennial is native to the eastern United States and to a few sites in the mountains of the Southwest. Erect, single-stemmed plant grows to 2–4 ft. high and 1 ft. wide. Sawtooth-edged leaves are set directly on the stems. Spikes of flame red, inch-long flowers show up in summer.
This annual is from South Africa. Popular, dependable edging plant grows to 3–6 in. high. Compact forms reach 5–9 in. wide; trailing types spread to 1 1/2 ft. Leafy, branching stems with green or bronzy green foliage. Blooms from early summer to frost, bearing 3/4-in.-wide flowers in light blue to violet (sometimes pink, reddish purple, or white) with white or yellowish throats. Lives over winter in mild climates. In mild-winter, hot-summer regions, grow it as a winter-to-spring annual.
Perennial. Group of hybrids of uncertain ancestry. Can reach 5 ft. tall and 1 ft. wide; many combine red leaves and red flowers. Compliment series, to 2 1/2 ft. high, has dark green leaves; blossoms may be scarlet, deep red, or blue-purple. Fan series grows to 2 ft. high and 16 in. wide; comes in blue, burgundy, red, rose, salmon, and scarlet. ‘Grape Knee-Hi’, 2 ft. high, is a sturdy plant with rich purple blooms. Provide rich soil, ample water, full sun or partial shade.
Native to Europe and southwest Asia. Each 8-in. stem carries three to eight 1-in.-wide, star-shaped fl...
Green, ferny-looking leaves are finely divided into many narrow, toothed leaflets. Bloom from mid- to ...
Native to 2,000–12,000-ft. elevations from western Nebraska and the Dakotas into the Sierra Neva...