Cardinal Flower produces spikes of bright red flowers late in the summer. Grow the plant near water as it prefers moist soils.
Lobelia grows best in partial shade and needs winter protection.
When grown in full sun, be sure to provide a moist soil. Remove the first flower spike as it fades to encourage side shoots which extend the blooming season. Fertilize when the first flower spike is removed. Clumps should be divided at least every three years. Seed sown in autumn will give plants which bloom in early spring.