Sprinkle the lobelia seeds on the surface of a good seed compost and do not cover the tiny flower seeds with anything, the lobelia seeds need light to germinate. Gently firm the compost down after you sprinkled the seeds. Keep the seed trays, pots at a temperature of 18-24 Celsius. The germination can take 14-20 days.

To propagate by seed, you have a couple of options. ... You can keep these seeds for several years. When you are ready to start them, sow them on top of moist soil six to eight weeks before the last frost. Do not press them into the soil as they need light to germinate.

Lobelia seeds can be sown directly in the garden or indoors for later transplanting. These plants typically require an area with full sun but will tolerate partial shade. They also prefer moist, rich soil. ... Spread the tiny seeds just on top of the soil and water thoroughly.

Cardinal flower will take two years to bloom, forming a large rosette the first year. Allow the plants to self-sow. They are heavy feeders, so compost or a shot of granular fertilizer when they begin growth is recommended.. . . . .364011233568!]0000000000000009783314144733!]