North America Native Plant

Southern Island Phacelia

Botanical name: Phacelia floribunda

USDA symbol: PHFL

Life cycle: annual

Habit: forb

Native status: Native to the lower 48 states  

Southern Island Phacelia: A Rare California Native Worth Protecting Meet the southern island phacelia (Phacelia floribunda), one of California’s most elusive wildflowers. This annual native plant might not be a household name, but it represents something precious in our Golden State’s botanical heritage – a species that’s become increasingly rare ...

Rare plant alert!

Region: Conservation status by state

Status: S2: Status is uncertain but is somewhere between the following rankings: 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) ⚘

Southern Island Phacelia: A Rare California Native Worth Protecting

Meet the southern island phacelia (Phacelia floribunda), one of California’s most elusive wildflowers. This annual native plant might not be a household name, but it represents something precious in our Golden State’s botanical heritage – a species that’s become increasingly rare in the wild.

A True California Original

Southern island phacelia is exclusively native to California, making it a genuine local treasure. As an annual forb, this delicate wildflower lacks woody stems and completes its entire life cycle within a single growing season. Like other members of the forb family, it’s an herbaceous plant that dies back each year, relying on seeds to continue its legacy.

Currently, this species is found only in California, though its exact distribution within the state reflects its precarious status in nature.

A Conservation Concern

Here’s where things get serious – southern island phacelia carries a Global Conservation Status of S2, which translates to Imperiled. This classification means the species is extremely rare, with typically only 6 to 20 known occurrences and somewhere between 1,000 to 3,000 remaining individuals in the wild. That’s not many plants standing between this species and extinction.

What this means for gardeners: If you’re considering adding southern island phacelia to your garden, you absolutely must ensure any plant material comes from responsible, ethical sources. Never collect seeds or plants from wild populations, as this could push an already vulnerable species closer to extinction.

Why Consider This Rare Beauty?

Despite the conservation concerns – or perhaps because of them – there are compelling reasons to consider southern island phacelia for your California native garden:

  • Conservation impact: Growing rare natives in cultivation can serve as a genetic backup and help raise awareness about threatened species
  • True local heritage: Few plants can claim to be more authentically Californian than this endemic species
  • Annual interest: As an annual, it provides seasonal variety and can fill gaps in perennial plantings
  • Educational value: It’s a conversation starter about native plant conservation

The Reality of Growing a Rare Plant

Let’s be honest – detailed growing information for southern island phacelia is limited, partly due to its rarity. What we do know is that as a California native annual, it likely prefers conditions similar to other native annuals from the region. However, without extensive cultivation experience, growing this species successfully may require some experimentation and patience.

The lack of readily available growing guides also means you’ll be pioneering cultivation techniques, which can be both challenging and rewarding for dedicated native plant enthusiasts.

Responsible Sourcing is Everything

Cannot stress this enough – if you want to grow southern island phacelia, sourcing is critical. Here’s what responsible sourcing looks like:

  • Purchase only from reputable native plant nurseries that can verify their propagation methods
  • Look for nurseries that specifically state they grow plants from ethically collected seeds
  • Avoid any source that cannot provide clear information about their plant origins
  • Consider connecting with botanical gardens or conservation organizations that might have cultivation programs

The Bigger Picture

Southern island phacelia represents a broader story about California’s native plant heritage. Many of our state’s most unique species exist in small, isolated populations that face ongoing threats from development, climate change, and habitat loss.

By choosing to grow rare natives like southern island phacelia – when sourced responsibly – gardeners become part of the conservation solution. Your garden can serve as a refuge for genetic diversity and help ensure these remarkable plants don’t disappear forever.

Should You Grow It?

The answer depends on your commitment to conservation gardening. If you’re passionate about preserving California’s botanical heritage and willing to work with responsible suppliers, southern island phacelia could be a meaningful addition to your native garden. Just remember that with rarity comes responsibility – every seed and every plant matters when a species hangs in the balance.

For those interested in supporting native plant conservation but looking for easier-to-grow alternatives, consider other California native phacelias that are more common and readily available. Your local native plant society can recommend similar species that provide habitat benefits without the conservation concerns.

Southern Island Phacelia

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

Solanales

Family

Hydrophyllaceae R. Br. - Waterleaf family

Genus

Phacelia Juss. - phacelia

Species

Phacelia floribunda Greene - southern island phacelia

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