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Lobelia (blue)

Use our zone-based planting guide to know when to plant lobelia blue.

Plant name Zone Start seeds indoors (spring/fall) Start seeds outdoors (spring/fall) Plant seedlings/transplants outdoors (spring/fall) Plant spacing # plants per person
Lobelia (blue) 3a Feb. 15-March 1 On/around May 15 (after last frost) May 30-June 15 6-8 inches n/a
Lobelia (blue) 3b Feb. 15-March 1 On/around May 15 (after last frost) May 30-June 15 6-8 inches n/a
Lobelia (blue) 4a Feb. 15-March 1 On/around May 15 (after last frost) May 30-June 15 6-8 inches n/a
Lobelia (blue) 4b Feb. 15-March 1 On/around May 15 (after last frost) May 30-June 15 6-8 inches n/a
Lobelia (blue) 5a Jan. 15-Feb. 1 On/around April 15 (after last frost) April 30-May 15 6-8 inches n/a
Lobelia (blue) 5b Jan. 15-Feb. 1 On/around April 15 (after last frost) April 30-May 15 6-8 inches n/a
Lobelia (blue) 6a Jan. 15-Feb. 1 On/around April 15 (after last frost) April 30-May 15 6-8 inches n/a
Lobelia (blue) 6b Jan. 15-Feb. 1 On/around April 15 (after last frost) April 30-May 15 6-8 inches n/a
Lobelia (blue) 7a Jan. 15-Feb. 1 On/around April 15 (after last frost) April 30-May 15 6-8 inches n/a
Lobelia (blue) 7b Jan. 15-Feb. 1 On/around April 15 (after last frost) April 30-May 15 6-8 inches n/a
Lobelia (blue) 8a Dec. 15-Jan. 1 On/around March 15 (after last frost) March 30-May 15 6-8 inches n/a
Lobelia (blue) 8b Dec. 15-Jan. 1 On/around March 15 (after last frost) March 30-May 15 6-8 inches n/a
Lobelia (blue) 9a 10-12 weeks before planting outside year-round year-round 6-8 inches n/a
Lobelia (blue) 9b 10-12 weeks before planting outside year-round year-round 6-8 inches n/a
Lobelia (blue) 10a 10-12 weeks before planting outside year-round year-round 6-8 inches n/a
Lobelia (blue) 10b 10-12 weeks before planting outside year-round year-round 6-8 inches n/a
Lobelia (blue) 11a 10-12 weeks before planting outside year-round year-round 6-8 inches n/a
Lobelia (blue) 11b 10-12 weeks before planting outside year-round year-round 6-8 inches n/a

* Seeds germinate slowly. You can start seeds, but it's best to go with starter plants. Can be grown as a perennial in Zones 9-11. Direct sow seeds after the last frost, but keep seedlings inside until 2-4 weeks after the last frost.