Edging Lobelia, Annual Lobelia, Trailing Lobelia 'Regatta Midnight Blue'

Lobelia erinus

Family: Campanulaceae (kam-pan-yew-LAY-see-ee) (Info)
Genus: Lobelia (low-BEE-lee-a) (Info)
Species: erinus (EAR-rin-us) (Info)
Cultivar: Regatta Midnight Blue
Additional cultivar information:(Regatta series)



Foliage Color:

Unknown - Tell us

Bloom Characteristics:

Unknown - Tell us

Water Requirements:

Average Water Needs; Water regularly; do not overwater

Where to Grow:

Unknown - Tell us


under 6 in. (15 cm)


3-6 in. (7-15 cm)


Not Applicable

Sun Exposure:

Sun to Partial Shade


All parts of plant are poisonous if ingested

Bloom Color:

Dark Blue

Bloom Time:

Mid Summer

Blooms repeatedly




Other details:

Unknown - Tell us

Soil pH requirements:

6.1 to 6.5 (mildly acidic)

6.6 to 7.5 (neutral)

7.6 to 7.8 (mildly alkaline)

Patent Information:


Propagation Methods:

From herbaceous stem cuttings

From seed; sow indoors before last frost

From seed; direct sow after last frost

Seed Collecting:

Allow pods to dry on plant; break open to collect seeds

N/A: plant does not set seed, flowers are sterile, or plants will not come true from seed


This plant has been said to grow in the following regions:

Chico, California

Paradise, California

Wamego, Kansas

Grand Rapids, Michigan

Lees Summit, Missouri

Mooresville, North Carolina

Freeland, Washington

show all

Gardeners' Notes:


On Oct 14, 2013, mehitabel45 from Whidbey Island, WA (Zone 8b) wrote:

I often use this in my window boxes. They get shade until the afternoon, and then about 4-6 hours of sun, but our afternoon temps seldom get above 80, so they thrive until hard frost hits in November. Every now and then, I just take the scissors to them, and they just keep on coming. Gorgeous blue, and I like it better than the Sapphire, which has a distinct white eye.


On May 10, 2011, ogon from Paradise, CA (Zone 9a) wrote:

I planted trailing lobelia in a pot containing a sego palm that I overwinter in a well-lit shed for frost protection. Even though they're hardy in zone 9, winter frost tends to make segos lose their outer leaves so I prefer to protect mine. Not only did the "annual" lobelia survive the winter in the shed, it thrived and has taken over most of the pot. We'll see if it keeps going this winter too!


On Nov 1, 2010, troop1819 from Lees Summit, MO wrote:

I really like this plant when in full bloom and it is a nice addition to a hanging basket if it is a shade loving basket. In my area they are sold as a 'sun annual' but do not survive midwest heat in July and August. I did plant some under our river birches this year on the east side of the house, and they got a little scraggly in the heat of the summer but have bounced back with cooler temps and are blooming away again, are a nice complement to Dahlberg Daisies.