North America Native Plant

Mildred’s Clarkia

Botanical name: Clarkia mildrediae mildrediae

USDA symbol: CLMIM

Life cycle: annual

Habit: forb

Native status: Native to the lower 48 states  

Mildred’s Clarkia: A Rare California Native Worth Protecting Meet Mildred’s clarkia (Clarkia mildrediae mildrediae), a charming yet elusive annual wildflower that calls California home. This little-known native plant deserves a spot in the conservation conversation, and potentially in your garden – if you can find it and grow it responsibly. ...

Rare plant alert!

Region: Conservation status by state

Status: S3T3: 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 ⚘ Subspecies or variety is 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. ⚘

Mildred’s Clarkia: A Rare California Native Worth Protecting

Meet Mildred’s clarkia (Clarkia mildrediae mildrediae), a charming yet elusive annual wildflower that calls California home. This little-known native plant deserves a spot in the conservation conversation, and potentially in your garden – if you can find it and grow it responsibly.

What Makes Mildred’s Clarkia Special?

Mildred’s clarkia belongs to the evening primrose family and represents one of California’s many endemic treasures. As an annual forb, this herbaceous plant completes its entire life cycle in a single growing season, making every year a fresh start and every successful bloom a small victory.

What sets this plant apart isn’t just its lovely name (we’re curious about the Mildred it honors!), but its rarity. With a conservation status of S3T3, this species appears to have a limited distribution and may face conservation challenges in the wild.

Where Does It Grow?

This California exclusive has chosen the Golden State as its only home within the lower 48 states. Like many California natives, it has likely adapted to the state’s unique Mediterranean climate and diverse microclimates.

Should You Grow Mildred’s Clarkia?

Here’s where things get interesting – and responsible. If you’re a California gardener interested in rare natives, Mildred’s clarkia could be a fascinating addition to your collection. However, its conservation status means you’ll need to be extra thoughtful about sourcing.

The conservation angle: Growing rare natives in gardens can actually help preserve genetic diversity and provide backup populations. Plus, you’ll be part of a small group of gardeners helping to keep this species alive and thriving.

The challenge factor: Limited information about this plant means you’ll be somewhat of a pioneer in figuring out its preferences. Some gardeners love this kind of horticultural detective work!

Growing Conditions and Care

Since specific growing information for Mildred’s clarkia is scarce, we can make some educated guesses based on its California native status and annual nature:

  • Likely prefers well-draining soil (most California natives do)
  • Probably adapted to periods of drought followed by winter/spring moisture
  • May need a cold treatment period for seed germination (common in California annuals)
  • Best grown from seed rather than transplants

The Responsible Approach

If you decide to grow Mildred’s clarkia, please:

  • Only source seeds or plants from reputable native plant nurseries
  • Never collect from wild populations
  • Consider contacting local native plant societies or botanical gardens for growing advice
  • Keep detailed records of your success and failures – you could contribute valuable information about this species!

Alternative California Clarkias

If Mildred’s clarkia proves too elusive or challenging, California offers many other beautiful Clarkia species that are easier to find and grow. Consider elegant clarkia (Clarkia unguiculata) or farewell-to-spring (Clarkia amoena) for that same lovely wildflower charm with more available growing information.

The Bottom Line

Mildred’s clarkia represents the fascinating world of rare California natives – plants that remind us how much botanical diversity exists in our own backyards. While it may not be the easiest plant to grow, it offers the reward of connecting with California’s unique natural heritage and potentially contributing to conservation efforts.

Whether you choose to seek out this rare gem or opt for one of its more common cousins, growing California native annuals adds seasonal interest and supports local ecosystems. Sometimes the most rewarding plants are the ones that make us work a little harder!

Mildred’s 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 mildrediae (A. Heller) F.H. Lewis & M.E. Lewis - Mildred's clarkia

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