North America Native Plant

Wilcox’s Woollystar

Botanical name: Eriastrum wilcoxii

USDA symbol: ERWI

Life cycle: annual

Habit: forb

Native status: Native to the lower 48 states  

Synonyms: Eriastrum sparsiflorum (Eastw.) H. Mason var. wilcoxii (A. Nelson) Cronquist (ERSPW)   

Wilcox’s Woollystar: A Delightful Native Wildflower for Western Gardens If you’re looking for a charming native wildflower that asks for very little but gives back plenty, let me introduce you to Wilcox’s woollystar (Eriastrum wilcoxii). This delightful little annual might not be the showiest plant in your garden, but it’s ...

Wilcox’s Woollystar: A Delightful Native Wildflower for Western Gardens

If you’re looking for a charming native wildflower that asks for very little but gives back plenty, let me introduce you to Wilcox’s woollystar (Eriastrum wilcoxii). This delightful little annual might not be the showiest plant in your garden, but it’s got personality in spades and plays an important role in supporting local ecosystems.

What is Wilcox’s Woollystar?

Wilcox’s woollystar is a native annual forb – that’s garden-speak for a non-woody flowering plant that completes its life cycle in one year. Don’t let the woollystar name fool you into thinking it’s fuzzy all over; the woolly refers to the soft, downy clusters where its tiny star-shaped flowers nestle together like little celestial gatherings.

You might occasionally see this plant listed under its synonym Eriastrum sparsiflorum var. wilcoxii, but regardless of what name you encounter, you’re looking at the same lovely little wildflower.

Where Does It Call Home?

This western native has quite an impressive range across the American West. You’ll find Wilcox’s woollystar growing naturally in California, Idaho, Nevada, Oregon, Utah, Washington, and Wyoming. It’s perfectly adapted to the challenging conditions of these regions, from desert valleys to mountain foothills.

Why Consider Wilcox’s Woollystar for Your Garden?

Here’s where this unassuming little plant really shines:

  • Pollinator magnet: Those tiny flowers are like welcome mats for small native bees and beneficial insects
  • Low maintenance: As a native annual, it’s naturally adapted to local conditions
  • Drought tolerant: Perfect for water-wise gardening
  • Naturalizing ability: Will often self-seed for next year’s display
  • Authentic habitat: Supports local wildlife and maintains regional character

Garden Design and Landscape Role

Wilcox’s woollystar isn’t going to be your garden’s main attraction, but it’s an excellent supporting player. Think of it as nature’s confetti – scattered throughout a wildflower meadow, tucked into rock garden crevices, or naturalized in areas where you want a soft, informal look.

This plant is perfect for:

  • Native plant gardens
  • Xerophytic (drought-tolerant) landscapes
  • Wildflower meadows
  • Rock gardens
  • Naturalized areas

Growing Conditions and Care

The beauty of working with native plants is that they’re already adapted to succeed in your region’s conditions. Wilcox’s woollystar thrives in:

  • Sunlight: Full sun exposure
  • Soil: Well-drained, sandy, or rocky soils (it actually prefers poor soils!)
  • Water: Low water requirements once established
  • Hardiness: Generally suitable for USDA zones 4-9, depending on your specific location

Planting and Care Tips

Growing Wilcox’s woollystar is refreshingly straightforward:

  • Seeding: Direct seed in fall or early spring when temperatures are cool
  • Soil prep: Don’t overdo it – this plant likes lean, well-drained soil
  • Watering: Provide occasional water during establishment, then let nature take over
  • Maintenance: Minimal! Let plants go to seed if you want them to return next year

One of the best things about annuals like Wilcox’s woollystar is that they often surprise you by showing up in unexpected places the following year, creating a more natural, less controlled garden aesthetic.

The Bottom Line

While Wilcox’s woollystar might not win any garden beauty contests, it’s a solid choice for gardeners who want to support native ecosystems while creating low-maintenance, sustainable landscapes. It’s particularly valuable if you’re gardening in the western states where it naturally occurs – you’ll be providing authentic habitat for local pollinators and maintaining the regional character of your landscape.

If you’re new to native gardening, this little wildflower is a great place to start. It’s forgiving, asks for very little, and teaches you to appreciate the subtle beauty of plants that have called your region home for thousands of years.

Wilcox’s Woollystar

Classification

Group

Dicot

Kingdom

Plantae - Plants

Subkingdom

Tracheobionta - Vascular plants

Superdivision

Spermatophyta - Seed plants

Division

Magnoliophyta - Flowering plants

Subdivision
Class

Magnoliopsida - Dicotyledons

Subclass

Asteridae

Order

Solanales

Family

Polemoniaceae Juss. - Phlox family

Genus

Eriastrum Wooton & Standl. - woollystar

Species

Eriastrum wilcoxii (A. Nelson) H. Mason - Wilcox's woollystar

Plant data source: USDA, NRCS 2025. The PLANTS Database. https://plants.usda.gov,. 2/25/2025. National Plant Data Team, Greensboro, NC USA