North America Non-native Plant

Senecio Webbii

Botanical name: Senecio webbii

USDA symbol: SEWE7

Native status: Not native but doesn't reproduce and persist in the wild

Senecio webbii: The Mystery Plant That Has Botanists Scratching Their Heads Ever stumbled across a plant name that seems to exist in the shadowy corners of botanical databases but nowhere else? Meet Senecio webbii, a species that’s about as elusive as a unicorn in your backyard. If you’re here because ...

Senecio webbii: The Mystery Plant That Has Botanists Scratching Their Heads

Ever stumbled across a plant name that seems to exist in the shadowy corners of botanical databases but nowhere else? Meet Senecio webbii, a species that’s about as elusive as a unicorn in your backyard. If you’re here because you’ve encountered this name somewhere and are wondering whether to add it to your garden wishlist, well, you’re in for quite the botanical detective story.

What We Know (Spoiler Alert: It’s Not Much)

Senecio webbii belongs to the vast Senecio genus, which includes everything from common groundsel to those trendy string-of-pearls houseplants. However, this particular species seems to have mastered the art of staying under the radar. While most of its Senecio cousins are well-documented with clear growing guides and distribution maps, S. webbii remains frustratingly mysterious.

The lack of readily available information about its native range, growing conditions, or even basic characteristics suggests this might be an extremely rare species, a taxonomic synonym that’s fallen out of use, or possibly even a name that exists more in databases than in actual gardens.

Should You Try to Grow It?

Here’s where things get tricky. Without clear information about Senecio webbii’s native status, invasive potential, or basic growing requirements, it’s nearly impossible to give you solid gardening advice. If you’ve somehow managed to source seeds or plants labeled as this species, proceed with extreme caution.

Better Alternatives from the Senecio Family

Rather than chasing this botanical ghost, why not consider some well-documented native Senecio species that can actually enhance your garden? Depending on your location, you might find:

  • Local groundsel species that provide excellent habitat for native insects
  • Regional Senecio varieties with known growing requirements
  • Native alternatives that offer similar aesthetic appeal with proven garden performance

The Bottom Line

Sometimes in gardening, as in life, the most honest answer is we just don’t know enough. Senecio webbii appears to fall into this category. Until more information surfaces about this mysterious species, your garden (and local ecosystem) would be better served by choosing well-documented native plants with clear growing guidelines.

If you’re determined to solve the mystery of Senecio webbii, consider reaching out to botanical institutions or native plant societies in your area. They might have insights that aren’t readily available online, or they could point you toward similar species that are better understood and more readily available.

Remember, the best gardens are built on plants you can actually grow successfully – and that means having reliable information about what those plants need to thrive.

Senecio Webbii

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

Asterales

Family

Asteraceae Bercht. & J. Presl - Aster family

Genus

Senecio L. - ragwort

Species

Senecio webbii (Sch. Bip.) Christ

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