Native Plants

Giant Woollystar

Eriastrum densifolium densifolium

USDA symbol: ERDED6

perennial subshrub

Lower 48 states: native

If you’re looking to add a touch of delicate charm to your drought-tolerant garden, meet the giant woollystar (Eriastrum densifolium densifolium). Don’t let the giant in its name fool you—this native California perennial is actually quite petite, but it packs a big punch when it comes to adding texture and ...

Giant Woollystar may be listed as rare in your area.
Global Conservation Status

Status: S4T3? | Apparently Secure: Uncommon but not rare, and usually widespread. Possible cause for longterm concern. Typically more than 100 occurrences in the state or more than 10,000 individuals.

Giant Woollystar: A Charming Native Perennial for California Gardens

If you’re looking to add a touch of delicate charm to your drought-tolerant garden, meet the giant woollystar (Eriastrum densifolium densifolium). Don’t let the giant in its name fool you—this native California perennial is actually quite petite, but it packs a big punch when it comes to adding texture and subtle beauty to your landscape.

What Makes Giant Woollystar Special?

Giant woollystar is a true California native, found exclusively in the Golden State’s diverse landscapes. As a herbaceous perennial, it returns year after year, forming small clumps of narrow, linear leaves topped with clusters of tiny, tubular flowers. The blooms range from pristine white to soft pale blue, creating a cloud-like effect that gives this plant its woolly moniker.

This charming forb belongs to the phlox family and has earned its place in native plant gardens across California. Currently, giant woollystar grows naturally in California, where it has adapted to the state’s unique climate and soil conditions.

  • Species observed
  • No observations

Why Choose Giant Woollystar for Your Garden?

There are several compelling reasons to consider adding giant woollystar to your landscape:

  • It’s a true California native, supporting local ecosystem health
  • Extremely drought tolerant once established
  • Attracts beneficial pollinators like native bees and butterflies
  • Low maintenance requirements
  • Perfect for rock gardens and xeriscape designs
  • Adds delicate texture without overwhelming other plants

Important Conservation Note

Before you rush out to plant giant woollystar, there’s something important to know: this species has a conservation status that suggests it may be somewhat uncommon in the wild. If you’re interested in growing this plant, make sure to source it only from reputable native plant nurseries that propagate their stock rather than collecting from wild populations. This ensures you’re supporting conservation efforts rather than potentially harming wild communities.

Growing Conditions and Care

Giant woollystar thrives in USDA hardiness zones 8-10, making it suitable for most of California’s climate regions. Here’s what this adaptable native needs to flourish:

Sunlight and Soil

Plant your giant woollystar in full sun locations with well-draining soil. Sandy or rocky soils are ideal, as this plant has evolved to handle California’s often challenging growing conditions. Avoid heavy clay soils that retain moisture, as this can lead to root problems.

Watering

Once established, giant woollystar is remarkably drought tolerant. During its first year, provide occasional deep watering to help establish a strong root system. After that, natural rainfall should be sufficient in most California locations. Overwatering is actually more harmful than underwatering for this desert-adapted native.

Planting Tips

Fall is the ideal time to plant giant woollystar, as this allows the plant to establish roots during the cooler, wetter months before facing its first summer. Space plants according to their expected mature size, and consider grouping several together for maximum visual impact.

Garden Design Ideas

Giant woollystar works beautifully in several garden settings:

  • Native California gardens alongside other indigenous species
  • Rock gardens where its delicate texture contrasts with bold stone features
  • Drought-tolerant landscapes as an accent plant
  • Pollinator gardens where it can attract beneficial insects
  • Container gardens with excellent drainage

The Bottom Line

Giant woollystar offers California gardeners a wonderful opportunity to grow a truly local native while creating habitat for pollinators and reducing water usage. Its delicate beauty and minimal care requirements make it an excellent choice for gardeners who want to embrace sustainable, regionally appropriate landscaping. Just remember to source your plants responsibly from reputable nurseries to support conservation efforts.

With proper siting and minimal intervention, giant woollystar can become a charming, long-lived addition to your native plant palette—a small but meaningful way to celebrate California’s incredible botanical heritage right in your own backyard.

Eriastrum densifolium densifolium is also known as...

Often we refer to plants by their common names. When shopping for plants the scientific name is the best way to positively identify the plant species you desire. But some plants have more than one name! While it doesn't happen often, nurseries might display one name while you're searching for another. Eriastrum densifolium densifolium is also known as:

Eriastrum densifolium Mason ssp. austromontanum | USDA symbol: ERDEA
Eriastrum densifolium Mason ssp. elongatum | USDA symbol: ERDEE
Eriastrum densifolium Mason ssp. mohavense | USDA symbol: ERDEM2
Hugelia densifolia | USDA symbol: HUDE

Why do some plants have more than one name? Over time plant species may be renamed for a few reasons:

  1. Botanists in different regions named the same plant without knowing it had already been classified.
  2. A species was reclassified after scientific advances in, for example, DNA analysis.
  3. Slight variations within a species are sometimes mistakenly identified as entirely new species.

Classification

Group: Dicot
Kingdom: Plantae - Plants
Subkingdom: Tracheobionta - Vascular plants
Superdivision: Spermatophyta - Seed plants
Division: Magnoliophyta - Flowering plants
Class: Magnoliopsida - Dicotyledons
Subclass: Asteridae
Order: Solanales
Family: Polemoniaceae Juss. - Phlox family
Genus: Eriastrum Wooton & Standl. - woollystar

Species: Eriastrum densifolium (Benth.) H. Mason - giant woollystar

Subspecies: Eriastrum densifolium (Benth.) H. Mason ssp. densifolium - giant woollystar

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