Familiar annuals with intensely coloured flowers. Sometimes listed as Edging Lobelia.
When I Get My Seedling Home
Keep seedlings under very bright light to prevent legginess. Artificial lights are ideal, but a bright (ideally, south-facing) room will work for the short term. You may have to pot on seedlings more than once before they go out to allow for root growth. This is done by transplanting them into a slightly larger container with enough additional soil to keep the container mostly full. Keep the soil moist by daily watering and allow for free drainage so the plants are never sitting water.
Transplanting
Do not transplant outside until night time temperatures are steadily 10°C (50°F) or warmer. This may mean keeping seedlings indoors for up to a month. The plants should not require any fertilizer until transplant time.
Growing
Lobelia is not cold hardy. Be strict about the transplanting temperature above. Lobelia is a spreading, cascading annual, so it's excellent for hanging baskets, window boxes, and tucking in between other annuals to fill in space. If growing in a row, start by spacing 15cm (6") apart. They will quickly grow into the space by early summer.