Botanical Interests Lobelia Seed

Yes, lobelia seeds are very fine and benefit from being started indoors 8 to 10 weeks before your last frost date. Because they are so small, surface-sow them on moist seed-starting mix and do not cover them, as they require light to germinate.

No, Lobelia erinus is an annual, meaning it completes its entire life cycle in one growing season. It will bloom beautifully throughout the summer but will die back once the first hard frost hits.

Lobelia thrives in partial shade, especially in warmer climates where the afternoon sun can be harsh. In cooler regions, they can handle more sun, but they generally prefer consistent moisture and protection from intense heat.

For a lush, full look in a 10-to-12-inch hanging basket, you should aim for 3 to 5 plants. Because they have a trailing habit, spacing them evenly around the perimeter will help them spill over the edges effectively.

While lobelia is generally low-maintenance, shearing the plants back by about half if they start to look leggy or stop blooming in mid-summer can encourage a fresh flush of flowers. This is especially helpful if your plants have been stressed by heat.