North America Native Plant

Spider Milkweed

Botanical name: Asclepias asperula

USDA symbol: ASAS

Life cycle: perennial

Habit: forb

Native status: Native to the lower 48 states  

Spider Milkweed: A Delicate Native Gem for Western Gardens If you’re looking for a charming native plant that packs a big punch in a small package, spider milkweed might just be your new garden favorite. This delicate-looking perennial proves that sometimes the most unassuming plants can be the most valuable ...

Spider Milkweed: A Delicate Native Gem for Western Gardens

If you’re looking for a charming native plant that packs a big punch in a small package, spider milkweed might just be your new garden favorite. This delicate-looking perennial proves that sometimes the most unassuming plants can be the most valuable additions to your landscape.

What is Spider Milkweed?

Spider milkweed (Asclepias asperula) is a native perennial that belongs to the milkweed family. Don’t let its common name fool you – there are no creepy crawlies involved! The spider reference comes from its thin, needle-like leaves that create an airy, delicate appearance in the garden.

This hardy little plant is a true native of the American West, naturally growing across eleven states: Arizona, California, Colorado, Idaho, Kansas, Nebraska, Nevada, New Mexico, Oklahoma, Texas, and Utah. It’s perfectly adapted to the challenging conditions of these regions, making it an excellent choice for gardeners dealing with hot, dry climates.

Why Choose Spider Milkweed for Your Garden?

Spider milkweed offers several compelling reasons to earn a spot in your landscape:

  • Pollinator magnet: Like all milkweeds, this species is crucial for monarch butterflies, serving as both a nectar source and host plant for their caterpillars
  • Drought tolerance: Once established, it thrives with minimal water – perfect for xeriscaping
  • Low maintenance: This tough little plant pretty much takes care of itself
  • Delicate beauty: Small clusters of white to pale pink flowers provide subtle charm
  • Wildlife support: Attracts various native bees, butterflies, and other beneficial insects

Perfect Garden Settings

Spider milkweed shines in several garden styles:

  • Native plant gardens: A natural choice for authentic regional plantings
  • Xeriscapes: Thrives in low-water landscapes
  • Pollinator gardens: Essential for supporting monarch butterflies
  • Rock gardens: Complements rocky, well-draining settings
  • Wildflower meadows: Adds delicate texture among bolder blooms

Growing Spider Milkweed Successfully

The good news is that spider milkweed is relatively easy to grow if you match its preferred conditions. Here’s what this desert native needs to thrive:

Growing Conditions

  • Sunlight: Full sun is essential – at least 6-8 hours daily
  • Soil: Well-draining soil is crucial; sandy or rocky soils are ideal
  • Water: Drought tolerant once established; avoid overwatering
  • Climate: Hardy in USDA zones 4-9

Planting and Care Tips

Getting spider milkweed established is straightforward with these guidelines:

  • Timing: Plant seeds in fall or early spring for best germination
  • Spacing: Allow adequate space for air circulation
  • Watering: Water regularly during the first growing season, then reduce to occasional deep watering
  • Maintenance: Deadhead spent flowers if you don’t want self-seeding, or leave them for wildlife
  • Winter care: Cut back dead stems in late fall or early spring

A Small Plant with Big Impact

While spider milkweed might not be the showiest plant in your garden, its ecological value is immense. Every spider milkweed plant you grow contributes to supporting monarch butterfly populations and countless other pollinators. Plus, once established, it’s one of those wonderful plant it and forget it species that keeps giving back year after year.

Whether you’re creating a water-wise landscape or simply want to support native wildlife, spider milkweed deserves consideration. This unassuming native proves that sometimes the most valuable garden additions are the ones that work quietly behind the scenes, supporting the intricate web of life that makes our outdoor spaces truly come alive.

Spider Milkweed

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

Gentianales

Family

Asclepiadaceae Borkh. - Milkweed family

Genus

Asclepias L. - milkweed

Species

Asclepias asperula (Decne.) Woodson - spider milkweed

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