North America Native Plant

Coastal Larkspur

Botanical name: Delphinium decorum tracyi

USDA symbol: DEDET

Life cycle: perennial

Habit: forb

Native status: Native to the lower 48 states  

Coastal Larkspur: A Rare California Native Worth Knowing About If you’re passionate about native plants and conservation, you may have heard whispers about coastal larkspur (Delphinium decorum tracyi). This intriguing California native is one of those plants that makes you feel like you’re part of an exclusive club – mainly ...

Rare plant alert!

Region: Conservation status by state

Status: S3T2T3: Status is uncertain but is somewhere between the following rankings: 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 ⚘ 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. ⚘

Coastal Larkspur: A Rare California Native Worth Knowing About

If you’re passionate about native plants and conservation, you may have heard whispers about coastal larkspur (Delphinium decorum tracyi). This intriguing California native is one of those plants that makes you feel like you’re part of an exclusive club – mainly because it’s quite rare and not something you’ll find at your typical garden center.

What Makes Coastal Larkspur Special?

Coastal larkspur is a perennial forb, which is just a fancy way of saying it’s a non-woody herbaceous plant that comes back year after year. As part of the beloved delphinium family, it likely shares the characteristic tall spikes of blue or purple flowers that make gardeners swoon, though specific details about this particular variety are surprisingly scarce in the botanical literature.

Where Does It Call Home?

This special plant is native to California, where it has carved out its niche in the Golden State’s diverse ecosystems. As a true California native, it’s perfectly adapted to the state’s unique climate patterns and growing conditions.

The Rarity Factor: Handle with Care

Here’s where things get serious, fellow plant lovers. Coastal larkspur has a conservation status of S3T2T3, which translates to rare and vulnerable. This means we need to be extra thoughtful about how we approach this plant. While it’s tempting to want to grow every rare beauty we encounter, responsible gardening means considering the bigger picture.

If you’re determined to include coastal larkspur in your garden, please – and I cannot stress this enough – only source it from reputable nurseries that propagate plants ethically. Never, ever collect seeds or plants from wild populations. These plants need every individual they can get to maintain healthy populations in their native habitats.

The Challenge of Growing Coastal Larkspur

I wish I could give you a detailed growing guide with all the tips and tricks, but here’s the honest truth: specific cultivation information for Delphinium decorum tracyi is extremely limited. This isn’t unusual for rare native plants that haven’t made it into mainstream horticulture.

What we do know:

  • It’s a perennial, so it should return each year once established
  • As a California native, it’s likely adapted to Mediterranean-type climates
  • Like most delphiniums, it probably prefers well-draining soil
  • It may require specific soil conditions or microclimates found in its native range

Should You Grow Coastal Larkspur?

This is where I put on my conservation hat. While coastal larkspur is undoubtedly a special plant, its rarity means it’s not the best choice for most home gardeners. Instead, consider these alternatives that will give you similar beauty while supporting conservation efforts:

  • Other native California delphiniums that are more common
  • Native lupines, which offer similar tall flower spikes
  • California native salvias for blue and purple flower options

If you’re a serious native plant enthusiast with experience growing rare species, and you can source coastal larkspur through proper channels, it could be a meaningful addition to a specialized native plant collection. Just remember that with rare plants comes great responsibility.

The Bottom Line

Coastal larkspur represents something precious – a piece of California’s natural heritage that needs our protection more than our gardens need its beauty. Sometimes the most loving thing we can do for a rare plant is to admire it from afar and work to protect its wild habitats instead of bringing it home.

That said, supporting ethical native plant nurseries that work with rare species can contribute to conservation efforts. If you do encounter coastal larkspur for sale, ask lots of questions about sourcing and propagation methods. Your curiosity and care make a difference in the world of plant conservation.

Coastal Larkspur

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

Ranunculales

Family

Ranunculaceae Juss. - Buttercup family

Genus

Delphinium L. - larkspur

Species

Delphinium decorum Fisch. & C.A. Mey. - coastal larkspur

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