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Lobelia 'Vedrariensis'

Lobelia x gerardii

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



Water Requirements:

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

Sun Exposure:

Sun to Partial Shade




Foliage Color:

Unknown - Tell us


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)

Where to Grow:

Grow outdoors year-round in hardiness zone

Can be grown as an annual


All parts of plant are poisonous if ingested

Bloom Color:

Medium Purple

Bloom Characteristics:

Flowers are good for cutting

This plant is attractive to bees, butterflies and/or birds

Bloom Size:

Unknown - Tell us

Bloom Time:

Mid Summer

Late Summer/Early Fall

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:

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


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

show all

Gardeners' Notes:


On Apr 26, 2015, coriaceous from ROSLINDALE, MA wrote:

The flower color is beautiful, a clear violet-purple. This plant lacks the big leafy bracts of L. siphilitica that detract from the flowers (at least in my opinion). Flowering stems stand up without support for me in partial shade.

I cut the main stem back partway when bloom seemed to be ending, and secondary stems extended the bloom season into October.

I wonder whether, if I pin the stem down along the ground early in the season, it will root at the nodes and produce many new plants that way? I know that works for L. cardinalis. I'm sure I won't even lose the bloom, because the nodes send up secondary flowering stems.

Armitage says that plants in commerce may be a cross between L. siphilitica and the tender L. x speciosa 'Queen
Victor... read more


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...


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.


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.


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..


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.


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