How To Start Lobelia from Seeds


Bright blue flowers brighten up any garden, especially those in full or partial shade. Lobelia's pure blue flowers provide a nice contrast to the many shades of green in foliage-rich shade gardens. Or plant them so they hang over the edges of containers and hanging baskets. Start seeds indoors eight to ten weeks before frost-free weather is expected in your area.

Step 1

Start your lobelia seeds in flat, shallow pans. Fill them with either a commercial seed-starting mix or make your own by combining equal parts of peat moss and vermiculite.

Step 2

Sow seeds by sprinkling them over the surface of the seed-starting mix. Press them into the mix lightly and do not cover; they need light to germinate.

Step 3

Mist the surface with water using a plastic spray bottle. Mist the seeds daily until they germinate, which should take about three weeks.

Step 4

Move the seed-starting trays under fluorescent lights as soon as they germinate. Position the lights so they are about 3 inches above the tops of the seedlings. Raise the lights as the seedlings grow taller, keeping the lights at least 3 inches above the tops of the plants.

Step 5

Keep the seed-starting medium damp by misting it every day with a plastic spray bottle.

Step 6

Transplant little clumps of lobelia seedlings into individual, 2-inch pots filled with regular indoor potting soil. Continue watering to keep the soil, moist but not wet.

Step 7

Acclimate the plants to outdoor conditions when they are about 3 to 4 inches high. Put them outdoors in shade for a few hours each day and bring the plants indoors at night, or if daytime temperatures are below 50 degrees F.

Step 8

Transplant your lobelia into the garden when all danger of frost has passed. Plant lobelia in partial shade, placing the individual clumps approximately 10 inches apart.

Things You'll Need

  • Flat shallow pans
  • Peat moss
  • Vermiculite
  • Spray bottle
  • Fluorescent lights
  • 2-inch pots
  • Indoor potting soil


  • Information on Starting Lobelia Seeds
Keywords: how to start lobelia from seeds, start lobelia from seeds, grow lobelia from seeds

About this Author

Sharon Sweeny has a college degree in general studies and worked as an administrative and legal assistant for 20 years before becoming a professional writer in 2008. She specializes in writing about home improvement, self-sufficient lifestyles and gardening.