Trumpet Spurflower
Rabdosia longituba

Family: Lamiaceae (lay-mee-AY-see-ee) (Info)
Genus: Rabdosia (rab-DOS-ee-uh) (Info)
Species: longituba (lon-jee-TOO-buh) (Info)
Synonym:Plectranthus longitubus

Category:

Perennials

Height:

24-36 in. (60-90 cm)

Spacing:

24-36 in. (60-90 cm)

36-48 in. (90-120 cm)

Hardiness:

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)

Sun Exposure:

Sun to Partial Shade

Light Shade

Danger:

Unknown - Tell us

Bloom Color:

Medium Blue

Bloom Time:

Late Summer/Early Fall

Foliage:

Deciduous

Herbaceous

Smooth-Textured

Other details:

Unknown - Tell us

Soil pH requirements:

Unknown - Tell us

Patent Information:

Non-patented

Propagation Methods:

Unknown - Tell us

Seed Collecting:

Unknown - Tell us

Regional

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

Elkton, Maryland

Roslindale, Massachusetts

Saint Louis, Missouri

Jamesburg, New Jersey

Raleigh, North Carolina

Rocky River, Ohio

Tullahoma, Tennessee

show all

Gardeners' Notes:

2
positives
0
neutrals
0
negatives
RatingContent
Positive

On Jan 25, 2014, coriaceous from ROSLINDALE, MA wrote:

In a friend's neglected garden, without irrigation for over a year, this produced profuse blue-violet flowers in October, in the tough dry shade of hemlocks. No seedlings.

What an astonishingly valuable garden plant, and so infrequently planted!

Positive

On Jul 28, 2010, Morgan8 from Tullahoma, TN wrote:

This plant has proven itself very sturdy even in tough, dry shade conditions. It has reseeded in abundance and I have dug up several to transplant and give away. This shade of blue is a rare treat in October, and I recommend siting it with a backdrop of contrasting autumn foliage.