North America Native Plant

American Bugseed

Botanical name: Corispermum americanum var. rydbergii

USDA symbol: COAMR

Life cycle: annual

Habit: forb

Native status: Native to the lower 48 states  

Synonyms: Corispermum nitidum auct. non Kit. ex Schult. (CONI3)   

American Bugseed: A Hardy Native Annual for Specialized Gardens Meet American bugseed (Corispermum americanum var. rydbergii), a humble native annual that might not win any beauty contests but certainly deserves recognition for its resilience and ecological role. This unassuming member of the amaranth family proves that not every native plant ...

American Bugseed: A Hardy Native Annual for Specialized Gardens

Meet American bugseed (Corispermum americanum var. rydbergii), a humble native annual that might not win any beauty contests but certainly deserves recognition for its resilience and ecological role. This unassuming member of the amaranth family proves that not every native plant needs showy blooms to earn its place in the garden.

What Is American Bugseed?

American bugseed is a native annual forb—essentially a non-woody herbaceous plant that completes its entire life cycle in one growing season. As a forb, it lacks significant woody tissue and produces new growth from buds at or below ground level each year. Don’t let the bugseed name fool you; this plant isn’t related to actual bugs but gets its common name from its small, seed-like fruits.

Where Does It Call Home?

This hardy native has made itself at home across a impressive swath of the American West and central regions. You’ll find American bugseed growing naturally in Arizona, Colorado, Nebraska, New Mexico, Oklahoma, Texas, and Utah. Its wide distribution speaks to its adaptability and hardiness across various climates and conditions.

Why You Might (Or Might Not) Want to Plant It

Let’s be honest—American bugseed isn’t going to be the star of your flower garden. Its aesthetic appeal is, shall we say, subtle. The small, inconspicuous flowers won’t stop traffic or earn compliments from neighbors. However, this plant has some compelling qualities that make it worth considering for specific garden situations:

  • Native plant gardens: Perfect for gardeners committed to supporting local ecosystems with indigenous species
  • Xeriscaping: Excellent choice for water-wise landscaping in arid regions
  • Erosion control: Its root system helps stabilize soil in challenging areas
  • Low-maintenance areas: Thrives with minimal care once established

On the flip side, if you’re looking for colorful blooms, dramatic foliage, or a plant that attracts butterflies and bees, American bugseed probably isn’t your best bet. This is a plant for the native plant purist rather than the casual gardener seeking instant curb appeal.

Growing Conditions and Care

The good news? American bugseed is refreshingly easy to please. This drought-tolerant native thrives in conditions that would stress many garden favorites:

  • Soil: Prefers sandy, well-draining soils but adapts to various soil types
  • Sunlight: Full sun is ideal
  • Water: Drought tolerant once established; avoid overwatering
  • Climate: Suitable for USDA hardiness zones 4-8

Planting and Care Tips

Since American bugseed is an annual, you’ll need to replant it each year or allow it to self-seed. Here’s how to give it the best start:

  • Sow seeds directly in the garden in spring after the last frost
  • Barely cover seeds with soil—they need light to germinate
  • Water gently until established, then reduce watering significantly
  • No fertilization needed—this plant actually prefers poor soils
  • Allow some plants to go to seed if you want natural reseeding

The Bottom Line

American bugseed won’t win any garden beauty pageants, but it’s a worthy choice for specific gardening goals. If you’re creating a native plant haven, need something tough for difficult sites, or want to support local ecosystems with indigenous species, this unassuming annual delivers. Just don’t expect it to provide the pizzazz of more ornamental natives—sometimes the most valuable garden residents are the quiet workhorses that simply get the job done.

American Bugseed

Classification

Group

Dicot

Kingdom

Plantae - Plants

Subkingdom

Tracheobionta - Vascular plants

Superdivision

Spermatophyta - Seed plants

Division

Magnoliophyta - Flowering plants

Subdivision
Class

Magnoliopsida - Dicotyledons

Subclass

Caryophyllidae

Order

Caryophyllales

Family

Chenopodiaceae Vent. - Goosefoot family

Genus

Corispermum L. - bugseed

Species

Corispermum americanum (Nutt.) Nutt. - American bugseed

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