Photo by Melody

PlantFiles: False Gromwell, Softhair Marbleseed, Bexar Marbleseed, Smooth Onosmodium
Onosmodium molle subsp. bejariense

Family: Boraginaceae
Genus: Onosmodium (on-os-MOH-dee-um) (Info)
Species: molle subsp. bejariense

Synonym:Onosmodium bejariense


12-18 in. (30-45 cm)
18-24 in. (45-60 cm)
24-36 in. (60-90 cm)

18-24 in. (45-60 cm)
24-36 in. (60-90 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)
USDA Zone 9a: to -6.6 C (20 F)
USDA Zone 9b: to -3.8 C (25 F)
USDA Zone 10a: to -1.1 C (30 F)
USDA Zone 10b: to 1.7 C (35 F)

Sun Exposure:
Full Sun

Unknown - Tell us

Bloom Color:
Pale Green
White/Near White

Bloom Time:
Mid Spring
Late Spring/Early Summer


Other details:
May be a noxious weed or invasive
This plant is attractive to bees, butterflies and/or birds
Drought-tolerant; suitable for xeriscaping
Self-sows freely; deadhead if you do not want volunteer seedlings next season

Soil pH requirements:
5.6 to 6.0 (acidic)
6.1 to 6.5 (mildly acidic)
6.6 to 7.5 (neutral)
7.6 to 7.8 (mildly alkaline)
7.9 to 8.5 (alkaline)

Patent Information:
Unknown - Tell us

Propagation Methods:
From herbaceous stem cuttings
From seed; direct sow after last frost

Seed Collecting:
Allow seedheads to dry on plants; remove and collect seeds

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1 positive
No neutrals
No negatives

Gardeners' Notes:

Positive htop On Jul 24, 2005, htop from San Antonio, TX (Zone 8b) wrote:

Some references to this plant state that it is endemic to Texas being found mostly in the Central and Edwards Plateau regions; however, other references state that it is endemic to Arkansas, Louisiana, Oklahoma and Texas. It is usually found on prairies in a sunny site. But, it inhabits woods also. It prefers rocky, sandy soil. Known also as Bexar marbleseed after being found in a riparian woodland along Acequia de It is Espada in Bexar County, Texas (of which San Antonio, Texas is located):hence its genus name "bejariense":Bexar = Bajer in Spanish).

It is woody roots, is roughly hairy throughout and is multi-stemmed. The leaves are stalkless and a grayish-green. The 5 parted 5/8" wide, creamish-green colored blooms have a tubular shape and appear on helix-shaped branched clusters (cyme). The petal tips are pointed and the petals have outer hairs. It blooms in June anad July. The fruit are nutlets. Seeds should be planted in spring and it can be rooted from cuttings taken in late summer. (Its genus name, Onosmodium, comes from its likeness to genus the Onosma genus which means "smell of a donkey".)

When I found it growing outside of a fence along a roadway in northen Bexar County, Texas (San Antonio), I was enjhanted by it. It took me a long time to identify it.


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

San Antonio, Texas
Argyle, Wisconsin

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