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.

Once established, the lobelia plant requires little maintenance. During hot, dry periods, care of lobelia requires that the plant should receive frequent watering, however, especially those in containers. A general-purpose liquid fertilizer can be given once a month or every four to six weeks, if desired.