North America Native Plant

Carrizo Mountain Sandmat

Botanical name: Chamaesyce pediculifera

USDA symbol: CHPE9

Life cycle: perennial

Habit: forb

Native status: Native to the lower 48 states  

Synonyms: Euphorbia pediculifera Engelm. (EUPE4)   

Carrizo Mountain Sandmat: A Desert Gem for Water-Wise Gardens If you’re looking to create a stunning desert garden that celebrates native plants while conserving water, let me introduce you to a delightful little ground-hugger: Carrizo Mountain sandmat (Chamaesyce pediculifera). This charming native perennial might not win any height contests, but ...

Carrizo Mountain Sandmat: A Desert Gem for Water-Wise Gardens

If you’re looking to create a stunning desert garden that celebrates native plants while conserving water, let me introduce you to a delightful little ground-hugger: Carrizo Mountain sandmat (Chamaesyce pediculifera). This charming native perennial might not win any height contests, but it’s got everything you need for a successful water-wise landscape.

Meet the Carrizo Mountain Sandmat

Carrizo Mountain sandmat is a native perennial forb that belongs to the spurge family. You might also see it listed under its former scientific name, Euphorbia pediculifera, but don’t let that confuse you – it’s the same wonderful plant! As a true native of the American Southwest, this little beauty has been thriving in harsh desert conditions long before we started worrying about water bills.

Where Does It Call Home?

This desert native has carved out its niche in the southwestern United States, specifically calling Arizona and California home. You’ll find it naturally growing in some pretty tough conditions – rocky slopes, sandy washes, and desert flats where other plants might throw in the towel.

Why You’ll Want This in Your Garden

Here’s where Carrizo Mountain sandmat really shines as a garden companion:

  • Water-wise wonder: Once established, this tough little plant needs minimal water, making it perfect for drought-tolerant landscaping
  • Native plant benefits: By choosing natives, you’re supporting local ecosystems and wildlife
  • Low maintenance: Perfect for gardeners who want beauty without the fuss
  • Pollinator friendly: Those tiny flowers may be small, but they can attract native bees and other small pollinators
  • Ground cover potential: Great for filling in gaps in rock gardens or desert landscapes

Perfect Garden Partners

Carrizo Mountain sandmat is ideal for:

  • Desert and xerophytic gardens
  • Rock gardens and alpine plantings
  • Water-wise landscapes
  • Native plant gardens
  • Naturalistic desert settings

Growing Conditions That Make It Happy

Like most desert natives, Carrizo Mountain sandmat has some specific preferences, but they’re pretty straightforward:

  • Sunlight: Full sun is essential – this plant loves to bask in bright light
  • Soil: Well-draining, sandy or rocky soil is crucial; avoid heavy clay or water-retentive soils
  • Water: Drought-tolerant once established; actually prefers dry conditions
  • Climate: Thrives in USDA hardiness zones 8-10, perfect for warm, arid climates

Planting and Care Tips

Getting your Carrizo Mountain sandmat established is refreshingly simple:

  • Timing: Plant in spring after the last frost for best establishment
  • Soil prep: Ensure excellent drainage – add sand or gravel to heavy soils if needed
  • Watering: Water regularly during the first growing season, then back off significantly once established
  • Spacing: Give plants room to spread as ground cover
  • Maintenance: Minimal pruning needed; remove any dead material in late winter

Pro tip: The biggest mistake gardeners make with desert plants is overwatering. When in doubt, err on the dry side – your sandmat will thank you!

A Word of Caution

Like other plants in the spurge family, Carrizo Mountain sandmat produces a milky sap that can be irritating to skin and eyes. Wear gloves when handling and keep away from children and pets.

The Bottom Line

Carrizo Mountain sandmat might not be the showiest plant in your garden, but it’s definitely one of the most reliable. If you’re gardening in Arizona or California and want to embrace water-wise landscaping with native plants, this little ground-hugger deserves a spot in your landscape. It’s proof that sometimes the most unassuming plants make the biggest difference in creating sustainable, beautiful gardens that work with nature rather than against it.

Carrizo Mountain Sandmat

Classification

Group

Dicot

Kingdom

Plantae - Plants

Subkingdom

Tracheobionta - Vascular plants

Superdivision

Spermatophyta - Seed plants

Division

Magnoliophyta - Flowering plants

Subdivision
Class

Magnoliopsida - Dicotyledons

Subclass

Rosidae

Order

Euphorbiales

Family

Euphorbiaceae Juss. - Spurge family

Genus

Chamaesyce Gray - sandmat

Species

Chamaesyce pediculifera (Engelm.) Rose & Standl. - Carrizo Mountain sandmat

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