North America Native Plant

Ruby Chalice Clarkia

Botanical name: Clarkia rubicunda

USDA symbol: CLRU

Life cycle: annual

Habit: forb

Native status: Native to the lower 48 states  

Synonyms: Clarkia rubicunda (Lindl.) F.H. Lewis & M.E. Lewis ssp. blasdalei (Jeps.) F.H. Lewis & M.E. Lewis (CLRUB)   

Ruby Chalice Clarkia: A Charming California Native for Your Garden If you’re looking to add a splash of delicate color to your California native garden, ruby chalice clarkia (Clarkia rubicunda) might just be the perfect annual wildflower for you. This charming native puts on quite a show with its cup-shaped ...

Ruby Chalice Clarkia: A Charming California Native for Your Garden

If you’re looking to add a splash of delicate color to your California native garden, ruby chalice clarkia (Clarkia rubicunda) might just be the perfect annual wildflower for you. This charming native puts on quite a show with its cup-shaped blooms in lovely shades of pink and red, making it a delightful addition to naturalized landscapes and wildflower gardens.

What is Ruby Chalice Clarkia?

Ruby chalice clarkia is an annual forb native to California. As a forb, it’s essentially an herbaceous flowering plant – meaning it lacks woody stems and dies back each year, returning from seed the following season. Don’t let its delicate appearance fool you though; this little beauty is perfectly adapted to California’s Mediterranean climate and can thrive with minimal care once established.

Where Does it Naturally Grow?

This lovely wildflower calls California home, where it naturally occurs in the coastal ranges and foothills. You’ll find it thriving in the state’s characteristic Mediterranean climate zones, which correspond to USDA hardiness zones 8-10.

Why Plant Ruby Chalice Clarkia?

There are several compelling reasons to consider adding this native beauty to your garden:

  • Native plant benefits: As a true California native, it supports local ecosystems and requires less water than non-native alternatives
  • Pollinator magnet: The flowers attract bees, butterflies, and other beneficial insects, supporting biodiversity in your garden
  • Low maintenance: Once established, it’s quite drought-tolerant and requires minimal care
  • Seasonal interest: Provides beautiful spring and early summer color when many other plants are just getting started
  • Self-seeding: Will naturalize in appropriate conditions, creating larger displays over time

Perfect Garden Settings

Ruby chalice clarkia works beautifully in several garden styles:

  • Native California gardens and landscapes
  • Wildflower meadows and naturalized areas
  • Drought-tolerant and water-wise gardens
  • Seasonal color displays in Mediterranean-style landscapes
  • Pollinator gardens focused on supporting native wildlife

Growing Conditions and Care

The beauty of growing native plants is that they’re already perfectly adapted to local conditions. Here’s what ruby chalice clarkia prefers:

  • Sunlight: Full sun to partial shade
  • Soil: Well-draining soils; doesn’t tolerate waterlogged conditions
  • Water: Drought-tolerant once established; minimal supplemental watering needed
  • Climate: Mediterranean climate zones (USDA zones 8-10)

Planting and Care Tips

Growing ruby chalice clarkia is refreshingly straightforward:

  • When to plant: Direct seed in fall for best results, as seeds need winter chill
  • Seeding: Scatter seeds on prepared soil surface and lightly rake in
  • Watering: Water gently until germination, then reduce watering as plants establish
  • Maintenance: Minimal care required; allow plants to go to seed for natural reseeding
  • Fertilizing: Generally unnecessary; native soils provide adequate nutrition

A Few Considerations

While ruby chalice clarkia is a wonderful addition to appropriate gardens, keep in mind that it’s an annual plant, meaning it completes its entire life cycle in one growing season. This isn’t necessarily a drawback – it means you get fresh displays each year, and the plant will often self-seed to create natural colonies over time.

Since it’s adapted to California’s dry summers, it may not perform well in areas with high summer humidity or excessive moisture. Stick to its preferred Mediterranean-type climate for best results.

The Bottom Line

Ruby chalice clarkia is a delightful choice for gardeners looking to create beautiful, sustainable landscapes that support local wildlife. Its charming flowers, low maintenance requirements, and native status make it an excellent addition to California gardens. Whether you’re creating a dedicated native plant garden or simply want to add some seasonal color that benefits pollinators, this lovely annual deserves a spot in your landscape.

By choosing native plants like ruby chalice clarkia, you’re not just creating a beautiful garden – you’re contributing to the preservation of California’s natural heritage and supporting the creatures that call it home.

Ruby Chalice Clarkia

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

Clarkia Pursh - clarkia

Species

Clarkia rubicunda (Lindl.) F.H. Lewis & M.E. Lewis - ruby chalice clarkia

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