North America Native Plant

Diamondpetal California Poppy

Botanical name: Eschscholzia rhombipetala

USDA symbol: ESRH

Life cycle: annual

Habit: forb

Native status: Native to the lower 48 states  

Diamondpetal California Poppy: A Rare Native Gem Worth Protecting Meet the diamondpetal California poppy (Eschscholzia rhombipetala), one of California’s most elusive native wildflowers. While its famous cousin, the California poppy, paints hillsides golden across the state, this lesser-known relative exists in just a handful of locations, making it a true ...

Rare plant alert!

Region: Conservation status by state

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) ⚘

Diamondpetal California Poppy: A Rare Native Gem Worth Protecting

Meet the diamondpetal California poppy (Eschscholzia rhombipetala), one of California’s most elusive native wildflowers. While its famous cousin, the California poppy, paints hillsides golden across the state, this lesser-known relative exists in just a handful of locations, making it a true botanical treasure.

What Makes This Poppy Special?

The diamondpetal California poppy is an annual forb – basically a soft-stemmed plant that completes its entire life cycle in one growing season. Like other members of the poppy family, it likely produces cheerful, cup-shaped flowers that close at night and on cloudy days, though specific details about this rare species are scarce in botanical literature.

What we do know is that this plant is critically imperiled, earning a Global Conservation Status of S1. This means there are typically only five or fewer known occurrences of this species, with fewer than 1,000 individual plants remaining in the wild. That’s rarer than many endangered animals!

Where Does It Call Home?

This native California endemic has an extremely limited range within the Golden State. Unlike the widespread California poppy that thrives throughout the state and beyond, the diamondpetal California poppy clings to existence in just a few precious locations.

Should You Grow It in Your Garden?

Here’s where things get complicated. While we’d love to encourage growing every beautiful native plant, the diamondpetal California poppy’s critically imperiled status puts it in a special category. If you’re considering adding this rare beauty to your garden, please keep these important points in mind:

  • Only source seeds or plants from reputable conservation organizations or botanical gardens
  • Never collect from wild populations – this could push the species closer to extinction
  • Consider growing it as part of a conservation effort rather than just garden decoration
  • Connect with local native plant societies or conservation groups who might have ethical propagation programs

Better Alternatives for Your Garden

If you’re drawn to the charm of California poppies but want to be environmentally responsible, consider these more common native alternatives:

  • California poppy (Eschscholzia californica) – the state flower and readily available
  • Desert poppy (Eschscholzia glyptosperma) – another native species with wider distribution
  • Other native California annuals like baby blue eyes or farewell-to-spring

Growing Conditions and Care

While specific growing requirements for the diamondpetal California poppy aren’t well-documented due to its rarity, it likely shares similar needs with other Eschscholzia species. These typically prefer:

  • Well-draining, sandy or rocky soils
  • Full sun exposure
  • Mediterranean climate conditions
  • Minimal water once established
  • Direct seeding in fall or early spring

Supporting Conservation

The best way to help the diamondpetal California poppy is by supporting habitat conservation efforts. Consider donating to organizations working to protect California’s native plant communities, participating in citizen science projects, or volunteering with local conservation groups.

Sometimes the most beautiful way to appreciate a rare plant is to know it exists and work to keep it that way for future generations. The diamondpetal California poppy reminds us that not every treasure is meant for our gardens – some are meant to remain wild, rare, and wonderful in their natural homes.

The Bottom Line

While the diamondpetal California poppy is undoubtedly a fascinating native plant, its critically imperiled status means it’s better admired from afar and supported through conservation efforts rather than home cultivation. If poppies have captured your heart, there are plenty of other native California species that can bring that same golden magic to your garden without putting rare plants at risk.

Diamondpetal California Poppy

Classification

Group

Dicot

Kingdom

Plantae - Plants

Subkingdom

Tracheobionta - Vascular plants

Superdivision

Spermatophyta - Seed plants

Division

Magnoliophyta - Flowering plants

Subdivision
Class

Magnoliopsida - Dicotyledons

Subclass

Magnoliidae

Order

Papaverales

Family

Papaveraceae Juss. - Poppy family

Genus

Eschscholzia Cham. - California poppy

Species

Eschscholzia rhombipetala Greene - diamondpetal California poppy

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