Lobelia grows best in cool to moderately warm weather with plenty of moisture. Most garden varieties prefer partial shade in hot climates and full sun in cooler regions. The soil should be fertile, well-draining, and consistently moist without becoming waterlogged. A soil pH between slightly acidic and neutral generally works well. Regular watering is important, especially during dry weather, because lobelia can wilt quickly when the soil dries out. Providing afternoon shade during summer helps protect the plant from excessive heat and encourages healthier flowering.