Lobelia is visited by hummingbirds, butterflies and bees. Culture notes Propagate by dividing basal rosettes and replanting them in late fall, after flowering has ceased. Discard the old, woody central portion of the plant. 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.
Divide clumps at least every three years.
Lobelia will not stand heat and moisture stress, so protect plants from afternoon sun in the warmest regions. In my yard, plants are shaded in the afternoon by a huge Chinese photinia. Mulch plants to help them survive northern winters.