North America Native Plant

Shrubby Thoroughwort

Botanical name: Koanophyllon solidaginifolium

USDA symbol: KOSO

Life cycle: perennial

Habit: subshrub

Native status: Native to the lower 48 states  

Synonyms: Eupatorium solidaginifolium A. Gray (EUSO)   

Shrubby Thoroughwort: A Compact Native Gem for Southwestern Gardens Meet shrubby thoroughwort (Koanophyllon solidaginifolium), a delightful little native shrub that’s been quietly winning hearts across the Southwest. If you’re looking for a low-maintenance, drought-tolerant plant that still brings plenty of charm to your garden, this compact beauty might just be ...

Shrubby Thoroughwort: A Compact Native Gem for Southwestern Gardens

Meet shrubby thoroughwort (Koanophyllon solidaginifolium), a delightful little native shrub that’s been quietly winning hearts across the Southwest. If you’re looking for a low-maintenance, drought-tolerant plant that still brings plenty of charm to your garden, this compact beauty might just be your new best friend.

What Makes Shrubby Thoroughwort Special?

This perennial shrub is a true native of the American Southwest, naturally occurring across Arizona, New Mexico, and Texas. You might also see it listed under its former scientific name, Eupatorium solidaginifolium, but don’t let the name changes fool you – it’s the same wonderful plant.

What really sets shrubby thoroughwort apart is its perfect size for modern landscapes. This well-behaved shrub typically stays under 1.5 feet tall and rarely exceeds 3 feet at maturity, making it ideal for smaller spaces or as a neat border plant.

Why Your Garden (and Local Wildlife) Will Love It

Shrubby thoroughwort isn’t just easy on the eyes – it’s a pollinator magnet! In late summer and fall, when many other plants are winding down, this little shrub bursts into bloom with clusters of small, cream-colored to white flowers. Butterflies, bees, and other beneficial insects absolutely adore these nectar-rich blooms, making your garden a buzzing hub of activity.

The compact, shrubby form with narrow leaves creates an attractive texture in the landscape year-round, while the late-season flowers provide a lovely contrast to autumn foliage of other plants.

Perfect Garden Matches

Shrubby thoroughwort shines brightest in:

  • Xeriscaped and drought-tolerant gardens
  • Native plant gardens and naturalized areas
  • Desert-themed landscapes
  • Pollinator gardens
  • Low-maintenance border plantings

Growing Shrubby Thoroughwort Successfully

Climate Considerations: This heat-loving native thrives in USDA hardiness zones 7-10, making it perfect for gardeners in warmer climates.

Location, Location, Location: Give your shrubby thoroughwort a spot in full sun with well-drained soil. This plant absolutely despises wet feet, so avoid areas where water tends to collect.

Planting Tips: Spring is the ideal time to plant. While shrubby thoroughwort is incredibly drought-tolerant once established, give it regular water during its first growing season to help those roots get settled.

Ongoing Care: Here’s the best part – shrubby thoroughwort is remarkably low-maintenance once established. It rarely needs supplemental watering (except during extreme drought), doesn’t require regular fertilizing, and generally takes care of itself. A light pruning in late winter or early spring can help maintain its shape, but it’s not strictly necessary.

Is Shrubby Thoroughwort Right for Your Garden?

If you’re gardening in the Southwest and looking for a native plant that offers year-round structure, late-season blooms, and wildlife benefits without demanding constant attention, shrubby thoroughwort could be exactly what you need. It’s particularly valuable for gardeners embracing water-wise landscaping or those wanting to support local ecosystems with native plants.

The only gardeners who might want to look elsewhere are those in cooler climates (below zone 7) or anyone dealing with consistently moist soil conditions. For everyone else in its native range, this little thoroughwort is definitely worth considering for your next planting project!

Shrubby Thoroughwort

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

Koanophyllon Arruda - thoroughwort

Species

Koanophyllon solidaginifolium (A. Gray) R.M. King & H. Rob. - shrubby thoroughwort

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