North America Native Plant

Riddell’s Ragwort

Botanical name: Senecio riddellii

USDA symbol: SERI2

Life cycle: perennial

Habit: subshrub

Native status: Native to the lower 48 states  

Synonyms: Senecio spartioides Torr. & A. Gray var. fremontii (Torr. & A. Gray) Greenm. (SESPF)  âš˜  Senecio spartioides Torr. & A. Gray var. parksii (Cory) Shinners (SESPP3)   

Riddell’s Ragwort: A Late-Blooming Native Beauty for Prairie Gardens If you’re looking for a native wildflower that brings sunshine to your garden when most other plants are calling it quits for the season, let me introduce you to Riddell’s ragwort (Senecio riddellii). This unassuming prairie perennial might not win any ...

Riddell’s Ragwort: A Late-Blooming Native Beauty for Prairie Gardens

If you’re looking for a native wildflower that brings sunshine to your garden when most other plants are calling it quits for the season, let me introduce you to Riddell’s ragwort (Senecio riddellii). This unassuming prairie perennial might not win any beauty contests in spring, but come fall, it transforms into a golden spectacle that’ll have you wondering why you never heard of it before.

What Is Riddell’s Ragwort?

Riddell’s ragwort is a native perennial herb that belongs to the sunflower family. Don’t let the ragwort name fool you – this isn’t some weedy troublemaker. It’s a well-behaved prairie plant that grows as an upright forb, meaning it’s a non-woody flowering plant that dies back to the ground each winter and returns faithfully each spring.

This native beauty calls the American Great Plains and Southwest home, naturally occurring across nine states: Arizona, Colorado, Kansas, Nebraska, New Mexico, Oklahoma, South Dakota, Texas, and Wyoming. It’s perfectly adapted to the challenging conditions of these regions, making it an excellent choice for gardeners dealing with hot summers and unpredictable rainfall.

Why You’ll Love Growing Riddell’s Ragwort

Here’s where this plant really shines – literally. While most garden flowers are winding down in late summer and early fall, Riddell’s ragwort is just getting started. It produces masses of small, bright yellow daisy-like flowers that create a stunning golden display right when your garden needs it most.

The narrow, linear leaves give the plant an interesting texture throughout the growing season, and the upright growth habit makes it perfect for adding vertical interest to prairie gardens and wildflower meadows. But perhaps the best part? It’s incredibly low maintenance once established.

Perfect for Prairie and Drought-Tolerant Gardens

If you’re creating a native plant garden, prairie restoration, or drought-tolerant landscape, Riddell’s ragwort deserves a spot on your plant list. It’s particularly valuable in:

  • Wildflower meadows and prairie gardens
  • Xeriscaping and drought-tolerant landscapes
  • Native plant borders
  • Naturalized areas
  • Pollinator gardens

A Pollinator Magnet When It Counts

Those cheerful yellow blooms aren’t just pretty to look at – they’re absolute magnets for late-season pollinators. Butterflies, bees, and other beneficial insects flock to the flowers when many other nectar sources have disappeared for the year. This makes Riddell’s ragwort an essential player in supporting pollinator populations through the challenging transition into winter.

Growing Conditions and Care

One of the best things about Riddell’s ragwort is how easy it is to please. This tough prairie native thrives in USDA hardiness zones 4 through 9, handling both cold winters and scorching summers with grace.

Light: Full sun is essential for the best flowering and plant health.

Soil: Well-draining soil is a must. This plant abhors wet feet and will sulk (or worse, rot) in consistently moist conditions. It’s perfectly happy in average to poor soils and doesn’t need rich, amended earth to thrive.

Water: Once established, Riddell’s ragwort is remarkably drought tolerant. Water regularly the first year to help it get established, then step back and let nature take over. Overwatering is more likely to cause problems than underwatering.

Planting and Care Tips

Getting Riddell’s ragwort established in your garden is refreshingly straightforward:

  • Plant in spring after the last frost date
  • Space plants about 12-18 inches apart
  • Water regularly the first growing season to establish a strong root system
  • After that, this plant is largely self-sufficient
  • Cut back spent flower stems after blooming if you want to prevent self-seeding
  • Allow some flowers to go to seed if you’d like the plant to naturalize

Is Riddell’s Ragwort Right for Your Garden?

This native wildflower is perfect for gardeners who want maximum impact with minimal effort. If you love the idea of supporting native wildlife, creating habitat for pollinators, and having gorgeous fall color without the fuss of high-maintenance plants, Riddell’s ragwort might just be your new garden buddy.

However, it might not be the best choice if you prefer formal, manicured landscapes or have consistently wet soil conditions. This is definitely a plant for gardeners who appreciate the wild, naturalistic beauty of prairie plants.

With its late-season golden blooms, drought tolerance, and valuable wildlife benefits, Riddell’s ragwort proves that sometimes the most rewarding garden plants are the ones that know how to take care of themselves. Give this native charmer a try – your fall garden (and the local butterflies) will thank you.

Riddell’s Ragwort

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 riddellii Torr. & A. Gray - Riddell's ragwort

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