Photo by Melody

PlantFiles: 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

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24-36 in. (60-90 cm)

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

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

Unknown - Tell us

Bloom Color:
Medium Blue

Bloom Time:
Late Summer/Early Fall


Other details:
Unknown - Tell us

Soil pH requirements:
Unknown - Tell us

Patent Information:

Propagation Methods:
Unknown - Tell us

Seed Collecting:
Unknown - Tell us

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2 positives
No neutrals
No negatives

Gardeners' Notes:

Positive coriaceous 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 Morgan8 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.


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

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