Straggler Daisy, Prostrate Lawnflower, Hierba del caballo, Horseherb

Calyptocarpus vialis

Family: Asteraceae (ass-ter-AY-see-ee) (Info)
Genus: Calyptocarpus (kal-ip-toe-KAR-pus) (Info)
Species: vialis (VEE-uh-lis) (Info)
Synonym:Synedrellopsis grisebachii
Synonym:Synedrella vialis




Foliage Color:

Unknown - Tell us

Bloom Characteristics:

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

Water Requirements:

Drought-tolerant; suitable for xeriscaping

Average Water Needs; Water regularly; do not overwater

Where to Grow:

Unknown - Tell us


under 6 in. (15 cm)

6-12 in. (15-30 cm)


24-36 in. (60-90 cm)


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)

USDA Zone 11: above 4.5 C (40 F)

Sun Exposure:

Partial to Full Shade



Bloom Color:

Bright Yellow

Bloom Time:

Late Winter/Early Spring

Mid Spring

Late Spring/Early Summer

Mid Summer

Late Summer/Early Fall

Mid Fall

Late Fall/Early Winter


Grown for foliage


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)

Patent Information:

Unknown - Tell us

Propagation Methods:

From seed; direct sow outdoors in fall

By simple layering

Seed Collecting:

Allow pods to dry on plant; break open to collect seeds

Allow seedheads to dry on plants; remove and collect seeds


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

Brooksville, Florida

Abilene, Texas

Arlington, Texas

Austin, Texas (3 reports)

Belton, Texas

Boerne, Texas

Canyon Lake, Texas

Clute, Texas

Dallas, Texas (2 reports)

Euless, Texas

Fort Worth, Texas (2 reports)

Georgetown, Texas

Haltom City, Texas (2 reports)

Harlingen, Texas

Hondo, Texas

Huntsville, Texas

La Marque, Texas

Liberty Hill, Texas

Lumberton, Texas

Magnolia, Texas

Mc Kinney, Texas (2 reports)

Richmond, Texas

Rockport, Texas

San Antonio, Texas (4 reports)

Spicewood, Texas

show all

Gardeners' Notes:


On May 18, 2015, NolaCherie from Haltom City, TX wrote:

I think people just generally have disdain for any plant that they did not pay for & plant (any "volunteers").
How many times to people go into nurseries or ask gardening experts for an evergreen (in many areas), shade-tolerant, drought-resistant groundcover that is soft to walk on, doesn't need mowing, & will stand up to foot traffic? But then they go and pull up HorseHerb in their own yard, which meets all those criteria, and flowers to boot. (Horseherb is evergreen in areas with warming winters, will die back during freezes.) An organic gardening guru friend that taught classes at her home had a parking area for guests/students that was covered in HorseHerb. It even withstood cars parked on it!
I guess many people just inherently don't value a hardy native volunteer, no m... read more


On May 29, 2014, chuck7701 from McKinney, TX (Zone 8a) wrote:

Should be considered invasive if trying to grow other grasses in sunny areas of your yard. Easily controlled with a light spray of general herbicide like Weed B Gone in areas that it it invades or is not wanted. Pulling and digging it are not an option in the yard once established - gardens and beds, yes.

That being said, it does make a good drought tolerant ground cover in shaded areas where nothing else will grow. Can crowd out St. Augustine and Bermuda if unchecked or not mowed.


On Feb 18, 2014, afr from Dallas, TX wrote:

Yes, this plant can be aggressive--because it is so happy in its native habitat. Still, it's hard to argue with a native plant that thrives without any special care or fuss. It is drought-tolerant, shade-tolerant, and can even take light foot traffic. It can also be mowed for use as a lawn substitute ground cover. As for controlling its aggressive habit, simply use a small garden tool to remove unwanted plants by digging up the central root of each individual plant. The bare root plants are easy to transplant and re-establish elsewhere.


On Oct 13, 2013, Super65 from Belton, TX wrote:

Extremely invasive weed. I had never seen it before until a couple of years ago, when some came up in a shady area of the yard under a hackberry tree where grass wouldn't grow very well, so I left it alone. If it would have stayed there, there'd be no problem. Now it is EVERYWHERE, in all my beds, taking over the lawn even in sunny places of established grass. It is very hard to pull up all of the root, so it keeps coming back ten fold. It's taking over.


On Oct 29, 2012, mocarter from Abilene, TX wrote:

All 10 years we have lived in our house have been drought years so watering grass has simply not been something we've been willing to do though having more than dirt is certainly desirable. This little ground cover started under a mullberry tree in our front yard and has now almost worked its way around our entire yard, front and back. It keeps the yard colorful with its nice green foliage and tiny yellow flowers. No more problem keeping it out of where it's not wanted than would be grass. I love it!


On Aug 27, 2010, dmtom from Deep South, TX (Zone 9b) wrote:

I thought it would be a good ground cover till I found out where all those little burrs were comming from in the winter. They stick to the bottom of your shoes and you track them eveywhere, cars, house, office etc.


On Aug 19, 2010, vossner from Richmond, TX (Zone 9a) wrote:

I consider this a weed in my garden. Grows in moist areas and spreads at lightning speed. Extremely hard to remove and chokes out desirable plants.


On Nov 10, 2009, Mom2Layla from La Marque, TX wrote:

This little nuisance is trying to take over everything! And it is a pain to pull up!! It's now trying to outgrow my St. Augustine!


On Jan 28, 2009, cedarcrone from Rockport, TX (Zone 9a) wrote:

This is a great groundcove for the shade here in 9a; I wish I could buy seeds to sow where it hasn't covered yet. I would like to replace the St. Augustine grass with it; it doesn't need mowing nor watering. Stays green most of the year. So far it's easy to keep out of the flower beds; just pull it out and plant it elsewhere.


On Nov 27, 2006, frostweed from Josephine, Arlington, TX (Zone 8a) wrote:

Straggler Daisy, Prostrate Lawnflower, Hierba del caballo, Horseherb Calyptocarpus vialis is Naturalized in Texas and other States.


On May 30, 2002, Wingnut from Spicewood, TX (Zone 8b) wrote:

I like this little native Texan. It forms a nice clump of small yellow flowers amid small, green leaves. Tough little plant. If allowed to lean on or "climb" up something, as in the first photo above, it can reach a foot or so tall. Drought tolerant. Could be considered invasive if not kept in check.