North America Native Plant

Tall Ragwort

Botanical name: Senecio serra var. serra

USDA symbol: SESES

Life cycle: perennial

Habit: subshrub

Native status: Native to the lower 48 states  

Synonyms: Senecio serra Hook. var. altior Jeps. (SESEA2)  âš˜  Senecio serra Hook. var. integriusculus A. Gray (SESEI)   

Tall Ragwort: A Golden Native Wildflower for Western Gardens If you’re looking for a cheerful native wildflower that won’t demand much fussing, tall ragwort might just be your new garden buddy. This perennial beauty brings sunshine to western landscapes with its clusters of bright yellow, daisy-like blooms that seem to ...

Tall Ragwort: A Golden Native Wildflower for Western Gardens

If you’re looking for a cheerful native wildflower that won’t demand much fussing, tall ragwort might just be your new garden buddy. This perennial beauty brings sunshine to western landscapes with its clusters of bright yellow, daisy-like blooms that seem to glow against the mountainous backdrop of its natural habitat.

Meet the Tall Ragwort

Scientifically known as Senecio serra var. serra, tall ragwort is a native herbaceous perennial that belongs to the sunflower family. As a forb, it’s the kind of plant that stays relatively soft and green rather than developing woody stems like shrubs or trees. Think of it as nature’s way of creating a reliable, come-back-every-year wildflower that knows how to play well with others in the garden.

Where Does Tall Ragwort Call Home?

This golden beauty is a true westerner, native to nine states across the American West: California, Colorado, Idaho, Montana, Nevada, Oregon, Utah, Washington, and Wyoming. It’s perfectly adapted to the mountainous and high-elevation regions where summers can be warm and winters decidedly chilly.

Why Your Garden (and Local Wildlife) Will Love It

Tall ragwort isn’t just a pretty face – it’s a hardworking member of the garden community. Here’s why it deserves a spot in your landscape:

  • Pollinator magnet: Those cheerful yellow flowers are like a welcome mat for bees, butterflies, and other beneficial insects
  • Low maintenance: Once established, it’s quite drought tolerant and doesn’t need constant attention
  • Native credentials: Supporting local ecosystems by growing plants that naturally belong in your region
  • Long blooming period: Provides color and nectar sources throughout much of the growing season

Perfect Garden Spots for Tall Ragwort

This adaptable native fits beautifully into several garden styles:

  • Native plant gardens: A natural choice for authentic regional landscapes
  • Wildflower meadows: Adds structure and consistent color to naturalized areas
  • Pollinator gardens: Essential for supporting local bee and butterfly populations
  • Xeriscape gardens: Perfect for water-wise landscaping in its native range
  • Mountain or alpine gardens: Right at home in high-elevation settings

Growing Tall Ragwort Successfully

The good news is that tall ragwort is relatively easygoing when it comes to growing conditions, especially if you’re gardening within its native range of USDA hardiness zones 4-8.

Light and Location

Give your tall ragwort a spot with full sun to partial shade. It’s quite adaptable but tends to bloom most prolifically with plenty of sunlight.

Soil Requirements

Well-drained soil is key – this mountain native doesn’t appreciate soggy feet. Average to poor soils work just fine, and you don’t need to amend with rich compost or fertilizers. In fact, overly rich soil might make it too lush and prone to flopping over.

Watering Wisdom

Once established, tall ragwort is quite drought tolerant. Water regularly during its first growing season to help roots get established, then back off to occasional deep watering during extended dry spells.

Planting and Care Tips

  • Spring planting: Start from seed in early spring or plant nursery-grown specimens after the last frost
  • Spacing: Allow adequate room for air circulation to prevent potential fungal issues
  • Deadheading: Remove spent flowers to encourage continued blooming, or leave them if you want the plant to self-seed
  • Winter care: Cut back dead foliage in late fall or early spring – the plant will return from its roots

A Few Things to Keep in Mind

Like many plants in the Senecio genus, tall ragwort contains compounds that can be toxic to livestock and pets if consumed in large quantities. While this is rarely an issue in typical garden settings, it’s worth noting if you have grazing animals or particularly curious pets who tend to nibble on plants.

The Bottom Line

Tall ragwort offers western gardeners a wonderful opportunity to grow a truly native wildflower that supports local ecosystems while adding reliable color and charm to the landscape. Its combination of low maintenance needs, pollinator appeal, and authentic regional character makes it a smart choice for anyone looking to create a more sustainable and wildlife-friendly garden. Plus, there’s something deeply satisfying about growing a plant that’s been thriving in your local mountains and meadows for countless generations.

Tall 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 serra Hook. - tall ragwort

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