Lobelia is often highly prized by backyard gardeners for its bright flowers, which often attract hummingbirds and butterflies. Lobelia is easy to propagate from cuttings. The trick is to start from new growth, using stems that have not yet flowered.
Fill one or more of the clay pots with the general-purpose potting soil. Dampen the soil but don't get it too wet.
Cut one or more new-growth stems from a Lobelia plant, using the sharp knife or shears. Don't take cuttings from stems that have produced flowers. The cuttings should be about 4 to 5 inches long. Each should contain at least 3 nodes, tiny buds from which new leaves grow. Remove any leaves.
Use the pencil to make a hole in the potting soil and insert a cutting into the hole, covering about half of the cutting. Press the soil firmly around the cutting.
Keep your cuttings in a warm, bright area but out of direct sun. Mist the cuttings two or three times each day with the spray bottle and keep the soil damp but not wet.
Plant the cuttings outdoors when all possibility of frost has passed. Replant the Lobelia when the plant has plenty of new leaves and looks healthy.