North America Native Plant

Keck’s Checkerbloom

Botanical name: Sidalcea keckii

USDA symbol: SIKE

Life cycle: annual

Habit: forb

Native status: Native to the lower 48 states  

Keck’s Checkerbloom: A Rare California Treasure Worth Protecting Meet Keck’s checkerbloom (Sidalcea keckii), one of California’s most endangered wildflowers that deserves our attention and protection. This delicate annual belongs to the mallow family and represents a true botanical treasure that’s teetering on the edge of extinction. A Plant in Crisis ...

Rare plant alert!

Region: United States

Status: S1: Status is uncertain but is somewhere between the following rankings: Critically Imperiled: Extremely rare due to factor(s) making it especially vulnerable to extinction. Typically 5 or fewer occurrences or very few remaining individuals (<1,000) ⚘ Endangered: In danger of extinction throughout all or a significant portion of its range. ⚘

Region: United States

Keck’s Checkerbloom: A Rare California Treasure Worth Protecting

Meet Keck’s checkerbloom (Sidalcea keckii), one of California’s most endangered wildflowers that deserves our attention and protection. This delicate annual belongs to the mallow family and represents a true botanical treasure that’s teetering on the edge of extinction.

A Plant in Crisis

Before we dive into the beauty of this remarkable plant, there’s something crucial you need to know: Keck’s checkerbloom is critically imperiled. With a Global Conservation Status of S1 and listed as Endangered in the United States, this species typically has only 5 or fewer known occurrences and fewer than 1,000 remaining individuals in the wild. That makes it rarer than many animals we consider endangered!

Where to Find This California Native

Keck’s checkerbloom is endemic to California, meaning it grows naturally nowhere else on Earth. You’ll find it exclusively in California’s Central Valley and adjacent foothills, where it has adapted to the state’s unique Mediterranean climate over thousands of years.

What Makes It Special

This charming annual forb produces delicate pink to rose-colored flowers arranged in terminal clusters that bloom from spring through early summer. Like other members of the mallow family, each flower features five lovely petals that create a classic cup shape. The plant grows as a non-woody herbaceous species, completing its entire life cycle within a single growing season.

Garden Appeal and Growing Conditions

If you’re lucky enough to obtain responsibly sourced seeds or plants, Keck’s checkerbloom thrives in:

  • USDA hardiness zones 8-10
  • Well-drained soils
  • Full sun to partial shade locations
  • Mediterranean climate conditions
  • Native plant gardens and wildflower meadows

Pollinator and Wildlife Benefits

Despite its rarity, Keck’s checkerbloom plays an important ecological role. Its flowers attract native California bees and butterflies, providing nectar and pollen for these essential pollinators. By supporting this species, you’re helping maintain the delicate web of relationships that keep California’s ecosystems healthy.

Should You Plant Keck’s Checkerbloom?

Here’s where things get important: only plant Keck’s checkerbloom if you can source it responsibly. Due to its critically endangered status, collecting from wild populations could push this species closer to extinction. Instead:

  • Purchase only from reputable native plant nurseries with documented propagation programs
  • Contact local botanical gardens or conservation organizations
  • Consider participating in citizen science or conservation efforts
  • Support habitat restoration projects in California

Caring for Your Conservation Garden

If you do obtain Keck’s checkerbloom through responsible channels, treat it like the precious species it is. Provide excellent drainage, moderate watering during the growing season, and allow it to complete its natural annual cycle. Since it’s an annual, you’ll need to let it set seed to continue the population in your garden.

Alternative Native Choices

While working to source Keck’s checkerbloom responsibly, consider planting other California native Sidalcea species that are more readily available, such as checkermallow (Sidalcea malviflora) or white-flowered checkermallow (Sidalcea candida). These relatives offer similar beauty and ecological benefits without the conservation concerns.

Be Part of the Solution

Growing Keck’s checkerbloom isn’t just about adding a pretty flower to your garden—it’s about becoming a conservation partner. Every responsibly grown plant represents hope for this species’ survival and contributes to our understanding of how to protect California’s irreplaceable botanical heritage.

Remember: with great rarity comes great responsibility. If you choose to grow this endangered beauty, you’re not just a gardener—you’re a conservation hero helping ensure future generations can enjoy California’s natural treasures.

Keck’s Checkerbloom

Classification

Group

Dicot

Kingdom

Plantae - Plants

Subkingdom

Tracheobionta - Vascular plants

Superdivision

Spermatophyta - Seed plants

Division

Magnoliophyta - Flowering plants

Subdivision
Class

Magnoliopsida - Dicotyledons

Subclass

Dilleniidae

Order

Malvales

Family

Malvaceae Juss. - Mallow family

Genus

Sidalcea A. Gray - checkerbloom

Species

Sidalcea keckii Wiggins - Keck's checkerbloom

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