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



Foliage Color:

Unknown - Tell us

Bloom Characteristics:

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

Water Requirements:

Drought-tolerant; suitable for xeriscaping

Where to Grow:

Unknown - Tell us


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

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

Self-sows freely; deadhead if you do not want volunteer seedlings next season

Seed Collecting:

Allow seedheads to dry on plants; remove and collect seeds


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

San Antonio, Texas

Argyle, Wisconsin

Gardeners' Notes:


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 cl... read more