Customer Service Hours
Mon-Fri 8-4 MST
Features
Family
Campanulaceae
Native
Africa
Life Cycle
Perennial
Plant Height
Short (Under 12")
Flower Color
Mixed
Bloom Season
Spring to frost
Further Information
Plant Characteristics
- Attracts Beneficial Insects
- Attracts Pollinators
- Good for Containers
Plant Resistance
Deer Resistant
About Lobelia
Lobelia erinus
½" flowers in blue, lilac, red, ruby, and white
Planting Lobelia
Plant Spacing
Sow in groups of 12–20 seeds, 4"–6" apart
Hardiness Zones
10, 11
Light Required
Full sun to part shade
Plant Height
Short (Under 12")
Planting Depth
Press lightly into surface
Planting Details
| Seed Depth | Press lightly into surface |
|---|---|
| Seed Spacing | Sow in groups of 12–20 seeds, 4"–6" apart |
| Thinning | Not required. |
| Germination | 15–20 days |
| Start Indoors | RECOMMENDED. 8 to 10 weeks before your average last frost date. Ideal soil temperature for germination is 60°–70°F. |
| Direct Sow | 1 to 2 weeks after your average last frost date. In Mild Climates, sow in late summer for winter color. |
Find Your Frost Date & Grow Zone
Average First Frost Date
October 19
Average Last Frost Date
May 19
Your Hardiness Zone is
5b
Send Your Recommendation
Total 5 star reviews: 22 Total 4 star reviews: 2 Total 3 star reviews: 3 Total 2 star reviews: 3 Total 1 star reviews: 3
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Rating
Which best describes you as a gardener?
33 reviews
- Patrick P.Verified BuyerRated 2 out of 5 stars4/11/26I’m sing’n dah blues!
Although the germination rate was excellent, I only got one color. (blue) not a cascade of colors of red, white, and blue. I wish I would have read the reviews before making this purchase as many others have complained about the same situation.
Which best describes you as a gardener? ProfessionalBIBotanical Interests4/19/26Hey Patrick,
Thank you so much for taking the time to share your thoughts in a review. I've reached out to you via email to offer assistance. Your feedback is invaluable to us, and we are committed to ensuring your experience is positive. Thank you once again for your input. Keep on growing 🌻️
- Judy B.Verified BuyerRated 5 out of 5 stars9/30/25Did not bloom.
I believe I planted them too late.
Which best describes you as a gardener? IntermediateBIBotanical Interests10/1/25Hey Judy,
Thank you so much for your review! The best time to plant Cambridge Blue Lobelia seeds outdoors in your area is about one to two weeks after your average last frost date, which typically falls around April 11. This means mid to late April, or even early May depending on the spring weather, is generally a good time to sow them directly outside. If you’d like to get a head start, you can begin seeds indoors about 8 to 10 weeks before the last frost and then transplant them once the danger of frost has passed. This helps ensure strong, healthy plants that will thrive through the season. I hope that helps. Please feel free to reach out o us with any questions, or check our blog, www.epicgardening.com, or YouTube for more hints and tips. We're happy to help!
Keep on growing 🌻️ - RichardVerified BuyerRated 3 out of 5 stars8/23/25Dissapointed
Germination was very good however most the flowers were Blue, a few scattered white, and barley any other color. Not a good mix of colors. Would not buy again
Which best describes you as a gardener? IntermediateBIBotanical Interests8/26/25Hey Richard,
Thank you so much for taking the time to share your thoughts in a review. I've reached out to you via email to offer assistance. Your feedback is invaluable to us, and we are committed to ensuring your experience is positive. Thank you once again for your input. Keep on growing 🌻️
- JulieVerified ReviewerRated 3 out of 5 stars7/26/25Pretty but only blue
I bought these as I wanted the mixed colors and unfortunately, they are all blue. I sprinkle when I start seeds indoors and have six different bunches of plants throughout my garden beds so I know the packet is just blue - and that is the only reason why they lost two stars. They germinated fabulously and they are holding up in the hot sun and even if I miss a day or two or watering, they bounce right back.
Which best describes you as a gardener? IntermediateBIBotanical Interests8/15/25Hey Julie,
Thank you so much for taking the time to share your thoughts in a review. A flower might not bloom in the color you were expecting for several natural reasons, and it doesn’t necessarily mean something is wrong.
Soil conditions can play a role; certain flowers, like hydrangeas, change color based on soil pH and mineral content. Weather and temperature fluctuations, such as heatwaves or cold snaps, can impact pigment development and lead to muted or altered flower colors.
Your feedback is invaluable to us, and we are committed to ensuring your experience is positive. Thank you once again for your input. Keep on growing 🌻️ - Pat C.Verified BuyerRated 5 out of 5 stars2/17/255 Stars
I grew this cultivar from you last year and it did very well. I started the seeds I recently purchased under grow lights and they have germinated and are waiting for me to transfer them to individual cells. They will move to a cold frame with heating coil and eventually to cold frame with no heat. I will then plant them in my yard sometime in early May.