Lobelia erinus. Vivid navy blue flowers adorn this tiny, trailing Lobelia, making it ideal for stuffing between other plants as a ground cover. The flowers are highly attractive to bees and butterflies. Grow Midnight Blue Lobelia seeds in window boxes or hanging baskets, and allow it to cascade over the edges of any container. In moist soil it will thrive in full sun or partial shade. This trailing Lobelia looks fabulous with Alyssum, and fills in empty corners really well. Sow the tiny, dust-like seeds on the surface of moist soil, and do not transplant outside until night time temperatures are well above 10°C (50°F).
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.
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.
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.