North America Native Plant

Dwarf Suncup

Botanical name: Camissonia pygmaea

USDA symbol: CAPY5

Life cycle: annual

Habit: forb

Native status: Native to the lower 48 states  

Synonyms: Oenothera boothii Douglas ex Lehm. var. pygmaea (Douglas ex Lehm.) Torr. & A. Gray (OEBOP)  âš˜  Oenothera pygmaea Douglas ex Lehm. (OEPY)   

Dwarf Suncup: A Tiny Treasure for Pacific Northwest Gardens Meet the dwarf suncup (Camissonia pygmaea), a petite native wildflower that’s big on charm but small in stature. This delightful little annual brings a splash of sunshine to Pacific Northwest gardens with its cheerful yellow blooms, though finding it might require ...

Rare plant alert!

Region: Conservation status by state

Status: S3: Status is uncertain but is somewhere between the following rankings: Vulnerable: Either very rare and local throughout its range, found only in a restricted range (even if abundant at some locations), or factors are making it vulnerable to extinction. Typically 21 to 100 occurrences or between 3,000 and 10,000 individuals ⚘

Dwarf Suncup: A Tiny Treasure for Pacific Northwest Gardens

Meet the dwarf suncup (Camissonia pygmaea), a petite native wildflower that’s big on charm but small in stature. This delightful little annual brings a splash of sunshine to Pacific Northwest gardens with its cheerful yellow blooms, though finding it might require a bit of detective work.

What Makes Dwarf Suncup Special?

Don’t let the name fool you – while dwarf suncup is indeed small, it packs plenty of personality into its compact frame. As an annual forb (that’s garden-speak for a non-woody flowering plant), this native beauty completes its entire life cycle in just one growing season, making every bloom precious.

The dwarf suncup produces small, four-petaled yellow flowers that seem to capture bottled sunshine. Its low-growing habit makes it perfect for creating natural carpets of color in wildflower gardens and naturalized areas.

Where Does Dwarf Suncup Call Home?

This Pacific Northwest native has made itself at home in Idaho, Oregon, and Washington. You’ll typically find it thriving in the region’s unique climate conditions, adapted to the seasonal rainfall patterns and summer dry spells that characterize this corner of the country.

A Word of Caution: Rarity Matters

Here’s where things get serious for a moment. Dwarf suncup carries a Global Conservation Status of S3, meaning it’s considered vulnerable. With only 21 to 100 known occurrences and an estimated 3,000 to 10,000 individuals remaining, this little plant needs our protection.

If you’re interested in growing dwarf suncup, please only source seeds or plants from reputable native plant nurseries that practice responsible collection methods. Never harvest from wild populations – every plant counts when numbers are this low.

Why Grow Dwarf Suncup?

For gardeners passionate about native plants and conservation, dwarf suncup offers several compelling reasons to earn a spot in your garden:

  • True native status: Support local ecosystems by growing plants that belong
  • Pollinator magnet: Small native bees and other pollinators love these sunny blooms
  • Low maintenance: Once established, it requires minimal care
  • Conservation contribution: Help preserve a vulnerable species through responsible cultivation
  • Unique garden element: Few gardeners grow this rare beauty

Perfect Garden Settings

Dwarf suncup shines brightest in:

  • Native plant gardens focused on Pacific Northwest species
  • Wildflower meadows and naturalized areas
  • Rock gardens with well-draining soil
  • Conservation gardens dedicated to rare natives
  • Educational gardens showcasing regional biodiversity

Growing Conditions and Care

Like many Pacific Northwest natives, dwarf suncup prefers conditions that mimic its natural habitat:

  • Sun exposure: Full sun for best flowering
  • Soil: Well-draining soils; avoid heavy, waterlogged conditions
  • Water: Moderate water during growing season, dry summers
  • USDA Zones: 4-8, matching its native range

Planting and Care Tips

Growing dwarf suncup successfully means thinking like nature:

  • Timing: Direct seed in fall for natural cold stratification
  • Soil prep: Ensure excellent drainage – this plant hates wet feet
  • Spacing: Allow natural spacing for a meadow-like appearance
  • Water: Water during establishment, then let natural rainfall take over
  • Maintenance: Minimal intervention once established

The Bottom Line

Dwarf suncup isn’t for every gardener – its rarity means it should only be grown by those committed to conservation and responsible gardening practices. But for native plant enthusiasts willing to source seeds ethically, this little sunshine-bringer offers the chance to support a vulnerable species while adding something truly special to Pacific Northwest gardens.

Remember: every dwarf suncup you grow responsibly is a small victory for conservation. Just make sure you’re part of the solution by choosing only responsibly sourced plants and seeds.

Dwarf Suncup

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

Myrtales

Family

Onagraceae Juss. - Evening Primrose family

Genus

Camissonia Link - suncup

Species

Camissonia pygmaea (Douglas ex Lehm.) P.H. Raven - dwarf suncup

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