North America Native Plant

Torrey’s Popcornflower

Botanical name: Plagiobothrys torreyi var. diffusus

USDA symbol: PLTOD

Life cycle: annual

Habit: forb

Native status: Native to the lower 48 states  

Synonyms: Allocarya diffusa Greene (ALDI6)  âš˜  Plagiobothrys diffusus (Greene) I.M. Johnst. (PLDI)   

Torrey’s Popcornflower: A Rare California Native Worth Protecting If you’re passionate about native plants and conservation gardening, you’ve probably never heard of Torrey’s popcornflower (Plagiobothrys torreyi var. diffusus). This charming little annual is one of California’s botanical treasures – emphasis on little, since it’s becoming increasingly rare in the wild. ...

Rare plant alert!

Region: Conservation status by state

Status: S1Q: Status is uncertain but is somewhere between the following rankings: Uncertain taxonomy: ⚘ 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) ⚘

Torrey’s Popcornflower: A Rare California Native Worth Protecting

If you’re passionate about native plants and conservation gardening, you’ve probably never heard of Torrey’s popcornflower (Plagiobothrys torreyi var. diffusus). This charming little annual is one of California’s botanical treasures – emphasis on little, since it’s becoming increasingly rare in the wild. But don’t let its humble appearance fool you; this tiny wildflower packs a punch when it comes to supporting local ecosystems.

What Makes This Plant Special?

Torrey’s popcornflower belongs to the borage family, and like its relatives, it produces clusters of small, delicate white flowers that emerge from coiled stems – a characteristic that gives the entire family its distinctive look. The flowers are tiny but numerous, creating a subtle carpet of white blooms in spring. As an annual forb (that’s garden-speak for a non-woody flowering plant), it completes its entire life cycle in one growing season.

This native beauty is found naturally in California and Nevada, where it has adapted to the region’s Mediterranean climate and challenging growing conditions. However, here’s where things get serious: Plagiobothrys torreyi var. diffusus has a Global Conservation Status that suggests it’s quite rare in the wild.

A Conservation Alert for Responsible Gardeners

Before you start planning where to plant this beauty, there’s something crucial you need to know. Torrey’s popcornflower is considered rare, which means we need to be extra careful about how we grow and source it. If you’re interested in adding this plant to your garden, please only use seed or plants from reputable native plant nurseries that practice ethical harvesting and propagation methods. Never collect seed or plants from wild populations – they need every individual they can get!

Why Grow Torrey’s Popcornflower?

Despite its rarity (or perhaps because of it), there are compelling reasons to consider this plant for your native garden:

  • Conservation impact: By growing it responsibly, you’re helping preserve genetic diversity and potentially providing seed for restoration projects
  • Pollinator support: The small flowers attract native bees and other beneficial insects that are perfectly sized for the tiny blooms
  • Low maintenance: As a drought-adapted annual, it requires minimal care once established
  • Educational value: It’s a conversation starter about rare plants and conservation

Growing Conditions and Care

Torrey’s popcornflower thrives in conditions that mirror its natural habitat:

  • Sunlight: Full sun exposure
  • Soil: Well-draining soils; it’s not picky about soil type but abhors soggy conditions
  • Water: Drought-tolerant once established, but benefits from occasional water during dry spells
  • Climate: Best suited for USDA zones 8-10, matching its native California and Nevada range

Where Does It Fit in Your Garden?

This modest annual works beautifully in:

  • Native plant gardens focused on California flora
  • Wildflower meadows and naturalized areas
  • Rock gardens with other drought-tolerant natives
  • Conservation gardens dedicated to rare plants
  • Educational gardens at schools or nature centers

Planting and Care Tips

Growing Torrey’s popcornflower successfully requires understanding its annual nature:

  • Seeding: Direct seed in fall or early spring when temperatures are cool
  • Germination: Seeds need consistent moisture until germination, then reduce watering
  • Spacing: Allow natural spacing as seeds will find their preferred spots
  • Maintenance: Minimal intervention needed – let the plants complete their natural cycle
  • Seed collection: If you want to save seed, let some plants fully mature and collect responsibly

The Bottom Line

Torrey’s popcornflower might not win any beauty contests, but it’s a plant with purpose. If you’re committed to conservation gardening and can source it responsibly, this rare native annual offers a unique opportunity to participate in plant conservation while supporting local pollinators. Just remember – with rarity comes responsibility. Choose your sources carefully, and consider donating any extra seed to restoration organizations or botanical gardens working to preserve California’s native flora.

Sometimes the most important plants in our gardens are the ones most people have never heard of. Torrey’s popcornflower is one of those quiet heroes, deserving of our attention and protection.

Torrey’s Popcornflower

Classification

Group

Dicot

Kingdom

Plantae - Plants

Subkingdom

Tracheobionta - Vascular plants

Superdivision

Spermatophyta - Seed plants

Division

Magnoliophyta - Flowering plants

Subdivision
Class

Magnoliopsida - Dicotyledons

Subclass

Asteridae

Order

Lamiales

Family

Boraginaceae Juss. - Borage family

Genus

Plagiobothrys Fisch. & C.A. Mey. - popcornflower

Species

Plagiobothrys torreyi (A. Gray) A. Gray - Torrey's popcornflower

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