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Cirsium, Genus, texanum, Species,

Genus & species

Texas thistle

Asteraceae

South-central United States and northern Mexico

Attracts Pollinators Attracts Butterflies Deer Resistant Drought Tolerant

SunFull Sun

WaterLow · drought-tolerant

HardinessZones 6–9

Overview

Cirsium texanum is a spiny biennial or short-lived perennial thistle in the daisy family, native to the south-central United States and northern Mexico, growing 2-5 feet (0.6-1.5 m) tall on branched, grooved stems. In its first year it forms a low rosette of deeply lobed leaves; the second year it sends up a flowering stem clothed in alternate, spiny-margined leaves that are green above and thinly white-woolly beneath. From spring into summer the branch tips carry rounded flower heads 1-2 inches (2.5-5 cm) across, each a dense cluster of rose-pink to purple disc florets above a base of spine-tipped bracts. The heads release wind-borne seeds carried on tufts of pale bristles. It grows in prairies, pastures, roadsides, and open disturbed ground, tolerating heat, drought, and poor soil. The flowers feed many native bees and butterflies, though the spiny foliage and prolific seeding can make it a weed in grazed pastures.

Native Range

Native to the south-central United States and northern Mexico, common across Texas and extending into Oklahoma, Kansas, New Mexico, and Louisiana. It grows in prairies, grasslands, pastures, roadsides, and disturbed open ground.

Suggested Uses

Used in native, prairie, and pollinator plantings and wildflower meadows where its nectar and larval value suit naturalistic settings. Its spines and heavy seeding make it less suited to small beds, pastures, or tidy borders.

How to Identify

Look for a tall, branched thistle 2-5 feet (0.6-1.5 m) high with spiny-edged leaves that are green above and white-woolly beneath. The rose-pink to purple flower heads, 1-2 inches (2.5-5 cm) wide, sit above bracts tipped with slender spines. Its relatively slender heads and thin, weakly spined stems separate it from the stouter, more heavily armed bull thistle (Cirsium vulgare).

Appearance

Size & Dimensions

Height2' - 5'

Width/Spread1' - 2'

Colors

Flower Colors

Foliage Colors

Bloom Information

Bloom Period

~10 weeks

Flowers: April–July

Spring Summer

Flowering runs from spring into summer, roughly April to July, peaking in late spring. The pink-purple heads open over several weeks and draw bees, butterflies, and other pollinators. Tufted seeds follow and disperse on the wind, after which second-year plants die.

Detailed Descriptions

Flower Description

rose-pink to purple

Foliage Description

green above, white-woolly beneath

Growing Conditions

Sun Requirements

SunFull Sun

Requires 6-12 hours of direct sunlight daily

• Full Sun: 6+ hours of direct sunlight

• Partial Shade: 3-6 hours of direct sunlight

• Full Shade: Less than 3 hours of direct sunlight

Soil Requirements

pH Range6.0 - 8.0 (Neutral to alkaline)

3579

Soil Types

loam sand clay rocky

Drainagewell drained

Water & Climate

Water Needs

Low

Frost Tolerance

hardy

Drought Tolerance

Drought tolerant when established

Care & Maintenance

Care Guide

Grows in full sun on dry, well-drained soils of low to average fertility and tolerates heat, drought, and poor ground once established. It is hardy roughly in USDA zones 6-9 and lives as a biennial or short-lived perennial, dying after it flowers and sets seed. Rich, moist soils bring on lush, weak growth and heavier self-seeding. Little watering is needed, and the plant declines in wet or shaded conditions. It spreads only by seed, so removing seed heads before they ripen limits its spread. Few pests trouble it, though it is a host plant for painted lady butterfly larvae.

Pruning

Cutting or deadheading the flower heads before seeds ripen is the main task and curbs unwanted spread. Whole plants can be cut at the base after flowering, as second-year plants die anyway. No shaping is needed.