North America Native Plant

Marin Checkerbloom

Botanical name: Sidalcea hickmanii viridis

USDA symbol: SIHIV

Life cycle: perennial

Habit: subshrub

Native status: Native to the lower 48 states  

Marin Checkerbloom: A Rare California Native Worth Protecting If you’re passionate about native plants and conservation, you’ve likely come across some pretty special species in your gardening journey. Today, we’re talking about one of California’s rarest gems: the Marin checkerbloom (Sidalcea hickmanii viridis). This isn’t your typical add it to ...

Rare plant alert!

Region: Conservation status by state

Status: S3T1T2: Status is uncertain but is somewhere between the following rankings: Subspecies or variety is 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) ⚘ Subspecies or variety is imperiled: Extremely rare due to factor(s) making it especially vulnerable to extinction. Typically 6 to 20 occurrences or few remaining individuals (1,000 to 3,000) ⚘ 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 ⚘

Marin Checkerbloom: A Rare California Native Worth Protecting

If you’re passionate about native plants and conservation, you’ve likely come across some pretty special species in your gardening journey. Today, we’re talking about one of California’s rarest gems: the Marin checkerbloom (Sidalcea hickmanii viridis). This isn’t your typical add it to your shopping list kind of plant – it’s more of a appreciate it from afar and support its conservation situation.

What Makes Marin Checkerbloom Special?

Marin checkerbloom is a perennial forb that belongs to the mallow family. As a herbaceous plant, it lacks significant woody tissue and produces its growing buds at or below ground level. This delicate native has earned its place as one of California’s most treasured botanical residents, though you won’t find it at your local nursery anytime soon.

Where Does It Call Home?

This rare beauty is exclusively native to California, specifically endemic to Marin County. Talk about being a local! Its extremely limited geographic distribution makes it one of those plants that truly embodies the phrase think globally, act locally.

The Rarity Reality Check

Important Conservation Alert: Marin checkerbloom has a Global Conservation Status of S3T1T2, which indicates it’s critically imperiled. This means the species faces an extremely high risk of extinction or elimination. If you’re considering adding this plant to your garden, please proceed with extreme caution and only use responsibly sourced material from legitimate conservation programs.

Should You Grow Marin Checkerbloom?

Here’s where we need to have an honest conversation. While supporting native plants is fantastic, Marin checkerbloom requires special consideration:

  • Only for serious conservationists: This plant should only be grown by experienced gardeners working with legitimate conservation organizations
  • Responsible sourcing is critical: Never collect from wild populations – this could harm already vulnerable populations
  • Consider alternatives: Other Sidalcea species that are more common might satisfy your checkerbloom desires without conservation concerns

Growing Conditions and Care

Due to its rarity, specific growing information for Marin checkerbloom is limited. However, based on its Marin County origins, it likely prefers:

  • Mediterranean climate conditions
  • Well-draining soils
  • Moderate water during growing season
  • USDA hardiness zones 9-10

Wildlife and Pollinator Benefits

Like other members of the Sidalcea genus, Marin checkerbloom likely provides valuable nectar and pollen resources for native bees and butterflies. However, its conservation status means these benefits are currently limited to its natural habitat.

The Bottom Line

Marin checkerbloom represents something bigger than just another pretty flower for the garden. It’s a reminder of California’s incredible botanical diversity and the importance of conservation efforts. While most of us won’t be growing this rare beauty in our backyards, we can appreciate its existence and support organizations working to protect it.

If you’re drawn to the checkerbloom family, consider exploring more common Sidalcea species that can provide similar aesthetic appeal without the conservation concerns. Sometimes the best way to love a plant is to admire it from a distance and ensure future generations can do the same.

Marin 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 hickmanii Greene - chaparral checkerbloom

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