Native Plants

Blodgett’s Swallow-wort

Cynanchum blodgettii

USDA symbol: CYBL

perennial vine

Lower 48 states: native

Meet Blodgett’s swallow-wort (Cynanchum blodgettii), one of Florida’s most elusive native plants. While you might be drawn to the idea of growing this unique perennial herb, there are some very important reasons why this particular native should stay in the wild rather than in your garden. Blodgett’s swallow-wort is a ...

Blodgett’s Swallow-wort may be listed as rare in your area.
Global Conservation Status

Status: S1S2 | Imperiled: Extremely rare. Typically 6 to 20 occurrences or 1,000 to 3,000 remaining individuals.

Blodgett’s Swallow-wort: A Rare Florida Native You Shouldn’t Plant

Meet Blodgett’s swallow-wort (Cynanchum blodgettii), one of Florida’s most elusive native plants. While you might be drawn to the idea of growing this unique perennial herb, there are some very important reasons why this particular native should stay in the wild rather than in your garden.

What Makes This Plant Special

Blodgett’s swallow-wort is a perennial forb, meaning it’s a soft-stemmed plant that comes back year after year without developing woody tissue like trees and shrubs. As a member of the milkweed family, it’s related to some of our most beloved native plants, but this particular species is in a category all its own.

You might occasionally see this plant listed under its scientific synonym, Metastelma blodgettii, but regardless of the name, we’re talking about the same rare Florida endemic.

Where You’ll Find It (But Probably Won’t)

This native plant calls Florida home and only Florida. It’s what botanists call an endemic species, meaning it naturally occurs nowhere else in the world. Its extremely limited geographic range is already a red flag for conservation concerns.

  • Species observed
  • No observations

The Rarity Reality Check

Here’s where things get serious: Blodgett’s swallow-wort has a Global Conservation Status of S1S2, which puts it in the critically imperiled to imperiled category. In plain English? This plant is hanging on by a thread in the wild, and every individual plant matters for the species’ survival.

This rarity status means that even if you could find seeds or plants for sale (which you likely won’t), you absolutely shouldn’t attempt to grow it. These plants need to remain in their natural habitats where they have the best chance of survival and reproduction.

Why This Isn’t the Native Plant for Your Garden

While we’re huge advocates for native plant gardening, Blodgett’s swallow-wort presents a unique situation:

  • Its extreme rarity means removing any genetic material from wild populations could harm the species
  • There’s virtually no information available about cultivation requirements
  • No reputable native plant nurseries carry this species
  • Its specific habitat needs are likely very difficult to replicate in home gardens

Better Native Alternatives

Instead of pursuing this rare species, consider these fantastic Florida native alternatives that will give you similar benefits without conservation concerns:

  • Butterfly weed (Asclepias tuberosa) – Another milkweed family member with stunning orange flowers
  • White wild indigo (Amorpha fruticosa) – A native legume that supports diverse wildlife
  • Coontie (Zamia integrifolia) – Florida’s only native cycad
  • Firebush (Hamelia patens) – A native shrub beloved by butterflies and hummingbirds

How You Can Help

While you can’t grow Blodgett’s swallow-wort in your garden, you can still support its conservation:

  • Support organizations working to protect Florida’s natural habitats
  • Choose other native Florida plants for your landscape
  • Spread awareness about the importance of rare plant conservation
  • Report any sightings to local botanical organizations or state agencies

Remember, the best thing we can do for rare native plants like Blodgett’s swallow-wort is to protect their wild habitats and choose readily available native alternatives for our gardens. There are plenty of other fantastic Florida natives that will thrive in cultivation while supporting local wildlife – let’s give those plants the spotlight they deserve!

Cynanchum blodgettii is also known as...

Often we refer to plants by their common names. When shopping for plants the scientific name is the best way to positively identify the plant species you desire. But some plants have more than one name! While it doesn't happen often, nurseries might display one name while you're searching for another. Cynanchum blodgettii is also known as:

Metastelma blodgettii | USDA symbol: MEBL

Why do some plants have more than one name? Over time plant species may be renamed for a few reasons:

  1. Botanists in different regions named the same plant without knowing it had already been classified.
  2. A species was reclassified after scientific advances in, for example, DNA analysis.
  3. Slight variations within a species are sometimes mistakenly identified as entirely new species.

Classification

Group: Dicot
Kingdom: Plantae - Plants
Subkingdom: Tracheobionta - Vascular plants
Superdivision: Spermatophyta - Seed plants
Division: Magnoliophyta - Flowering plants
Class: Magnoliopsida - Dicotyledons
Subclass: Asteridae
Order: Gentianales
Family: Asclepiadaceae Borkh. - Milkweed family
Genus: Cynanchum L. - swallow-wort

Species: Cynanchum blodgettii (A. Gray) Shinners - Blodgett's swallow-wort

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