Deadhead for a neat appearance, to encourage rebloom or prevent any undesired reseeding. Pinch back for bushier and more compact plants. Cut back after flowering. Divide plants every 2-3 years. Propagate by seed sown in gentle heat as soon as ripe, or by bud cuttings in late summer.

Lobelia does not require a lot of maintenance. It does not need to be deadheaded because the plant self-cleans. Nor do deer pests tend to eat it. Lobelia does, however, tend to decline if subjected to full sun during very hot summers. If this happens to your plant, you can revive it by cutting it back and then providing water on a regular basis.