Photo by Melody

PlantFiles: Prairie Acacia, Whiteball Acacia, Fern Acacia, Timbre
Acacia angustissima

Family: Mimosaceae
Genus: Acacia (a-KAY-see-uh) (Info)
Species: angustissima (an-gus-TIS-sih-muh) (Info)

Synonym:Acaciella hirta

One vendor has this plant for sale.

2 members have or want this plant for trade.


36-48 in. (90-120 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
Sun to Partial Shade


Bloom Color:
White/Near White

Bloom Time:
Late Summer/Early Fall
Mid Fall


Other details:
This plant is attractive to bees, butterflies and/or birds
Average Water Needs; Water regularly; do not overwater
This plant may be considered a protected species; check before digging or gathering seeds

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:
From seed; direct sow outdoors in fall

Seed Collecting:
Allow pods to dry on plant; break open to collect seeds

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2 positives
3 neutrals
No negatives

Gardeners' Notes:

Positive Phellos On Aug 31, 2013, Phellos from Port Vincent, LA wrote:

I found this plant growing in a nearby area that was for cleared for a housing project. The area was raised with clay and gravel and is mowed every other month, but has been undeveloped for nearly twenty years. There are now many unusual muhly grasses and bristlegrasses that are normally not found this far east in Louisiana, along with this prairie acacia.

I first found it growing among some partridge pea sennas. It was out of bloom and I figured it was an unusual variation of the partridge pea... until I tried to uproot it. The taproot was unbelievably deep for such a small plant. I then noticed the woody base and remnants of old seed pods. It was then that I started to wonder if it was some kind of acacia. That's when I found this information.

I later found several more in the area and decided to dig one up to bring home. I planted it along the edge of my rock garden. Now, it grows to about two feet every year, blooms, and goes to seed. It is herbaceous, and dies to the ground every winter. It has not self sown, but I am now trying to manually plant seeds and establish a stand of them in my backyard.

Positive wormfood On Feb 16, 2009, wormfood from Lecanto, FL (Zone 9a) wrote:

I'm reading up on quail and this plant seed makes up most of the diet of the Masked Bobwhite. With careful reestablishment of native grasslands the endangered Bobwhites can make a comeback.

Neutral frostweed On Aug 23, 2006, frostweed from Josephine, Arlington, TX (Zone 8a) wrote:

Acacia angustissima is Native to Texas and other States.

Neutral htop On Feb 3, 2005, htop from San Antonio, TX (Zone 8b) wrote:

I have not grown this plant. Other common names for this deciduous, low-growing ground cover or subshrub are fern acacia, texas acacia, prairie acacia, Texas prairie acacia, whiteball acacia and prairie guajillo. It grows in full sun to partial shade and can be found on calcareous grasslands, rocky slopes and open woodlands. In Texas, it can be commonly found in the eastern two thirds of the state with it being it less common in west Texas. There are 3 identified varieties in Texas: var. hirta (A. hirta) - grows in east and central Texas; var. texensis (A. texensis) - grows in south Texas and the Trans-Pecos where it overlaps with var. chisosiana and var. chisosiana - found in S. Brewster and Presidio counties.

The fern-like foliage that folds together when touched, at night or with strong vibations. The small white round flowers appear from summer into the fall and are followed by 2- to 3-inch seed pods. It can spread laterally from its roots and the stems do not have thorns. Livestock and white-tailed deer enjoy browsing upon it. It is similar in appearance to Illinois bundleflower, Desmanthus illinoensis, but the leaf and fruit structures are different. It has a very deep growing taproot as do other acacias.

To control its growth and/or keep it compact, mow or trim it in the winter when it dies back. It can be used for soil erosion control and is a suitable plant for xericapes, wildscapes and rock gardens.

Neutral smiln32 On Aug 31, 2004, smiln32 from Oklahoma City, OK (Zone 7a) wrote:

Shrubby Acacia to 5'. Produces short racemes of white flowers that are tinged pink or lavender. Leaves are pinnate with 1/4" leaflets. Native to the U.S. and Mexico.


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

Oracle, Arizona
Monticello, Florida
Denham Springs, Louisiana
Arlington, Texas
San Antonio, Texas

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