1 / 8

Phacelia congesta

blue curls

Boraginaceae

Texas, the southwestern United States, and northern Mexico

Attracts Pollinators Attracts Butterflies Drought Tolerant

Native to North America

SunFull Sun – Part Shade

WaterLow · drought-tolerant

Overview

Phacelia congesta is a winter annual or short-lived biennial in the borage family (Boraginaceae), growing 1-3 feet (30-90 cm) tall on branched, hairy stems. The gray-green leaves are pinnately divided into toothed lobes and covered, like the stems, in soft glandular hairs that can irritate sensitive skin. The flowers are carried in tightly coiled clusters that uncurl as they open, a form that gives the plant the common name blue curls. Each flower is about 0.2-0.3 inch (5-8 mm) wide, lavender to blue-violet, with long stamens that extend well beyond the petals and give the cluster a fuzzy look. Blooming in spring, the flowers draw large numbers of bees and other pollinators. P. congesta grows on rocky slopes, road banks, brushland, and disturbed ground across central and western Texas, New Mexico, and northern Mexico, often appearing in masses after a wet winter. It germinates in fall or winter, flowers in spring, and dies as the soil dries in early summer. Being annual, it leaves no growth after seed set and depends on reseeding to return.

Native Range

Native to central and western Texas, New Mexico, Arizona, and northern Mexico. It grows on limestone and rocky slopes, road cuts, brushland, canyon edges, and disturbed open ground, often in large stands following wet winters.

Suggested Uses

Grown in native, pollinator, and wildflower gardens and in roadside and rangeland seed mixes across Texas and the Southwest. The spring flowers support many native bees, honeybees, and other insects. Its reseeding habit suits naturalized meadow plantings rather than formal beds.

How to Identify

Recognized by its coiled, one-sided flower clusters that unroll as the lavender to blue-violet flowers open, with long stamens projecting past the petals. The gray-green leaves are pinnately divided and, with the stems, coated in soft glandular hairs. The whole plant feels soft and slightly sticky. Its tall, branched, hairy form and curled flower clusters separate it from low-growing annual phacelias.

Appearance

Size & Dimensions

Height1' - 3'

Width/Spread10" - 1'6"

Colors

Flower Colors

Foliage Colors

Bloom Information

Bloom Period

~8 weeks

Spring

Flowers in spring, mainly March through May, with the coiled clusters opening progressively from the base so bloom continues for several weeks. Flowering is heaviest after a wet fall and winter. Bloom ends as warm, dry weather sets in and the plant goes to seed.

Detailed Descriptions

Flower Description

lavender to blue-violet

Foliage Description

gray-green

Growing Conditions

Sun Requirements

SunFull Sun SunPartial Shade

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 Range6.5 - 8.0(Alkaline)

357912

Soil Types

sand loam rocky

Drainagewell drained

Water & Climate

Water Needs

Low

Drought Tolerance

Drought tolerant when established

Care & Maintenance

Care Guide

Phacelia congesta grows in full sun to part sun on dry, well-drained rocky, sandy, or loamy soils with a pH near 6.5 to 8.0, including shallow soils over limestone. It is drought tolerant and grows on winter and spring rainfall, needing no irrigation. Rich or wet soil produces weak, floppy growth and shortens its life. It reseeds readily and returns from seed each year where the ground stays open. The glandular foliage can cause skin irritation, so it is handled with bare contact limited. Sown from seed in fall, it establishes a rosette over winter and flowers the following spring.

Pruning

No pruning is needed for this short-lived plant. Spent stalks can be cut once flowering finishes and seed has set. Leaving some seed heads to ripen and drop maintains the stand from year to year.

⚠️ Toxicity Warning

Unknown

Planting Guide

Planting Methods & Timing

Planting Method

direct sow

Direct Sow Timing

fall

Plant Spacing

12 inches