Purchase seedlings or transplants from a local garden store. Look for high quality transplants in the spring.
Prepare the soil. Lobelia can be grown in a container or in the garden. Use high quality commercial potting soil or good quality soil with compost added for garden planting.
Choose a location with full sun to part shade. If planting in containers or window boxes, you'll have the freedom to move these around if needed. Plant lobelia near the edges of containers so the plant will trail over the edge.
Purchase seeds at a garden store or online. This is necessary if you wish to have a specific variety of lobelia. The best varieties of lobelia are grown from cuttings and sold with brand names.
Follow the seed packet directions when planting seeds. Sow the seeds indoors, under lights, 8 to 10 weeks earlier in order to get the spring flowering.
Plant. Plant the seedlings in sunny well drained spots after the last frosts have gone or in a frost-free environment. Space plants 10-12 cm (4-5 in.) apart. In a container, lobelia can be grown more closely together.
Apply fertilizer regularly. A water soluble fertilizer is the easiest to use for fertilizing lobelia. Apply every 2-3 weeks for pots and window boxes and every 4-6 weeks in the garden.
Remove the spent flowers regularly. This will tidy up the plant and encourage new blooms.
The many colors of common lobelia are a great addition to any garden.
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