Photo by Melody

PlantFiles: Lobelia
Lobelia x gerardii 'Vedrariensis'

Family: Campanulaceae (kam-pan-yew-LAY-see-ee) (Info)
Genus: Lobelia (low-BEE-lee-a) (Info)
Species: x gerardii (jer-AR-dee-eye) (Info)
Cultivar: Vedrariensis

5 vendors have this plant for sale.

One member has or wants this plant for trade.


24-36 in. (60-90 cm)
36-48 in. (90-120 cm)

15-18 in. (38-45 cm)

USDA Zone 4b: to -31.6 C (-25 F)
USDA Zone 5a: to -28.8 C (-20 F)
USDA Zone 5b: to -26.1 C (-15 F)
USDA Zone 6a: to -23.3 C (-10 F)
USDA Zone 6b: to -20.5 C (-5 F)
USDA Zone 7a: to -17.7 C (0 F)
USDA Zone 7b: to -14.9 C (5 F)
USDA Zone 8a: to -12.2 C (10 F)
USDA Zone 8b: to -9.4 C (15 F)
USDA Zone 9a: to -6.6 C (20 F)
USDA Zone 9b: to -3.8 C (25 F)

Sun Exposure:
Sun to Partial Shade

All parts of plant are poisonous if ingested

Bloom Color:

Bloom Time:
Mid Summer
Late Summer/Early Fall


Other details:
Requires consistently moist soil; do not let dry out between waterings

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:
By dividing the rootball
From seed; winter sow in vented containers, coldframe or unheated greenhouse
From seed; sow indoors before last frost

Seed Collecting:
Allow pods to dry on plant; break open to collect seeds

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By Baa
Thumbnail #1 of Lobelia x gerardii by Baa

By Terry
Thumbnail #2 of Lobelia x gerardii by Terry

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Thumbnail #4 of Lobelia x gerardii by bagel_k

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Thumbnail #7 of Lobelia x gerardii by RosinaBloom

There are a total of 9 photos.
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3 positives
2 neutrals
1 negative

Gardeners' Notes:

Negative jardinomane On Aug 10, 2012, jardinomane from Gatineau
Canada wrote:

I whish I could write a positive review on the color alone, but this plant always flops in my garden so it looks more messy than pretty, sadly... And the individual plants are not very dense, they do not fill up to make a nice drift. The flowering period is long enough though.. Why does it flop like that for me? It is in full sun. Normally, plants flop in too much shade or when the soil is too rich, which is definitely not the case there. Could it be too dry or too poor for this one? I am puzzled...

Positive hymenocallis On Feb 12, 2009, hymenocallis from Auburn, AL (Zone 8a) wrote:

My plants crossed on their own and my resulting plants are cranberry colored not purple like those pictured above.

Positive simonska On Aug 17, 2008, simonska from Montclair, NJ (Zone 6b) wrote:

This is a great substitute for delphinium in hot humid areas. While the delphiniums are dropping dead in my garden, this lobelia looks great in August-Sept with its tall, dark purple spikes.

To keep this plant from dying over the winter, be sure to pull out the old crowns, and do not mulch the rosettes. They are hardy to at least zone 4, if they heave, just push them back in the ground.

Positive fluffygrue On Feb 16, 2006, fluffygrue from Manchester
United Kingdom (Zone 8a) wrote:

I love this plant. I had it growing in its pot in the pond this year - not entirely in the water, just about half the pot submerged, and it looked gorgeous. Being in the pond kept slugs/snails off, too. Will see how we get on next year..

Neutral pokerboy On Mar 19, 2005, pokerboy from Canberra
Australia (Zone 8b) wrote:

Lobelia x Gerardii is a hybrid between L. Cardinalis and L. Siphilitica. Vedrariensis has red tinted foliage and purple flowers. pokerboy.

Neutral Baa On Aug 19, 2002, Baa wrote:

A tall hybrid perennial.

Has lance shaped, mid-deep green leaves sometimes blushed with red. Bears 5 lobed, 2 lipped purple flowers on tall stems.

Flowers July-September

Love a moist but well-drained, fertile soil in sun or light shade.

It may need some winter cover in cold regions


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

Auburn, Alabama
Clayton, California
East Haddam, Connecticut
Gainesville, Florida
Cordele, Georgia
Palmyra, Illinois
Cleveland, Mississippi
Montclair, New Jersey
Plainsboro, New Jersey
Fremont, Ohio
Mogadore, Ohio
Pittsburgh, Pennsylvania

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