North America Native Plant

Newcombe’s Butterweed

Botanical name: Sinosenecio newcombei

USDA symbol: SINE5

Life cycle: perennial

Habit: forb

Native status: Native to Canada  

Synonyms: Senecio newcombei Greene (SENE12)   

Newcombe’s Butterweed: A Mysterious Native Canadian Perennial If you’re drawn to rare and unusual native plants, Newcombe’s butterweed (Sinosenecio newcombei) might just pique your curiosity. This enigmatic Canadian native is one of those plants that makes you feel like you’ve discovered a botanical secret – though admittedly, it’s a secret ...

Newcombe’s Butterweed: A Mysterious Native Canadian Perennial

If you’re drawn to rare and unusual native plants, Newcombe’s butterweed (Sinosenecio newcombei) might just pique your curiosity. This enigmatic Canadian native is one of those plants that makes you feel like you’ve discovered a botanical secret – though admittedly, it’s a secret that doesn’t reveal all its mysteries easily!

What is Newcombe’s Butterweed?

Newcombe’s butterweed is a perennial forb native to Canada, specifically found in British Columbia. As a forb, it’s an herbaceous plant without significant woody tissue – think of it as the botanical equivalent of a soft-stemmed wildflower rather than a shrub or tree. You might also see it listed under its former scientific name, Senecio newcombei, as botanical names sometimes get reshuffled as our understanding of plant relationships evolves.

Where Does It Grow?

This native beauty calls British Columbia home, making it a true child of Canada’s diverse ecosystems. Its limited geographic range adds to its mystique and suggests it may have very specific habitat requirements.

Should You Grow Newcombe’s Butterweed?

Here’s where things get a bit tricky – and honestly, quite fascinating from a plant nerd perspective. Newcombe’s butterweed is something of a botanical enigma. While we know it exists and where it’s from, detailed information about its cultivation, appearance, and growing requirements remains elusive.

This limited information could mean a few things:

  • It may be quite rare in its native habitat
  • It hasn’t been extensively studied or brought into cultivation
  • It might have very specific growing requirements that make it challenging to cultivate

The Challenge of Growing the Unknown

Without clear information about Newcombe’s butterweed’s preferred growing conditions, hardiness zones, or care requirements, attempting to grow this plant would be quite the gardening adventure. We don’t know if it prefers sun or shade, wet or dry conditions, or what type of soil makes it happiest.

If you’re determined to learn more about this plant, your best bet would be to:

  • Contact native plant societies in British Columbia
  • Reach out to botanical gardens or universities in the region
  • Connect with local naturalist groups who might have field experience with the species

Alternative Native Options

While the mystery of Newcombe’s butterweed remains unsolved, there are other native Senecio species and related plants that might scratch that same botanical itch. Consider exploring other native wildflowers from the Pacific Northwest that are better documented and more readily available for home cultivation.

The Bottom Line

Newcombe’s butterweed represents one of those intriguing gaps in our horticultural knowledge. While its rarity and mysterious nature make it fascinating, the lack of cultivation information makes it an impractical choice for most home gardeners. Sometimes the most responsible thing we can do for rare native plants is to appreciate them in their natural habitats and support conservation efforts rather than attempting to bring them into our gardens.

If you’re passionate about growing native Canadian plants, focus on well-documented species where you can be confident of success – and perhaps support research efforts that help us learn more about enigmatic species like Newcombe’s butterweed.

Newcombe’s Butterweed

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

Sinosenecio B. Nord. - butterweed

Species

Sinosenecio newcombei (Greene) J.P. Janovec & T.M. Barkley - Newcombe's butterweed

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