North America Native Plant

Texan Great Ragweed

Botanical name: Ambrosia trifida var. texana

USDA symbol: AMTRT

Life cycle: annual

Habit: subshrub

Native status: Native to the lower 48 states  

Synonyms: Ambrosia aptera DC. (AMAP)  âš˜  Ambrosia trifida L. var. aptera (DC.) Kuntze (AMTRA)   

Texan Great Ragweed: A Native Wildflower for Wildlife Enthusiasts If you’re looking for a plant that screams ornamental showstopper, Texan great ragweed (Ambrosia trifida var. texana) probably isn’t your first choice. But if you’re passionate about supporting native wildlife and creating authentic prairie landscapes, this humble annual might just earn ...

Texan Great Ragweed: A Native Wildflower for Wildlife Enthusiasts

If you’re looking for a plant that screams ornamental showstopper, Texan great ragweed (Ambrosia trifida var. texana) probably isn’t your first choice. But if you’re passionate about supporting native wildlife and creating authentic prairie landscapes, this humble annual might just earn a spot in your garden. Let’s dive into what makes this unassuming native plant worth considering—or perhaps worth passing by.

What is Texan Great Ragweed?

Texan great ragweed is a native annual forb that belongs to the sunflower family. As an herbaceous plant, it lacks the woody stems of shrubs and trees, instead producing soft, green growth that completes its entire life cycle in a single growing season. Don’t let the name ragweed scare you off completely—while it’s wind-pollinated and may contribute to seasonal allergies, it plays an important ecological role in its native habitats.

Where Does It Grow Naturally?

This Texas native has a surprisingly wide distribution across the United States. You’ll find Texan great ragweed growing naturally in Arizona, Illinois, Kansas, Louisiana, Massachusetts, Mississippi, Missouri, New Mexico, Oklahoma, and Texas. Its ability to thrive across such diverse climates speaks to its adaptability and hardiness.

Should You Plant Texan Great Ragweed?

Here’s where things get interesting. Texan great ragweed isn’t going to win any beauty contests, but it serves some important purposes in the right setting:

Reasons to Consider It:

  • Supports native ecosystems and biodiversity
  • Extremely low maintenance once established
  • Thrives in poor soils where other plants struggle
  • Provides habitat and food sources for wildlife
  • Authentic choice for prairie restoration projects

Reasons to Think Twice:

  • Limited ornamental appeal
  • May contribute to seasonal allergies
  • Can self-seed aggressively in ideal conditions
  • Not suitable for formal garden settings

Growing Conditions and Care

If you’ve decided Texan great ragweed fits your gardening goals, you’ll be pleased to know it’s remarkably easy to grow. This prairie native thrives in USDA hardiness zones 6-10 and prefers full sun exposure.

The plant is quite forgiving when it comes to soil conditions, actually preferring poor to average soils over rich, amended garden beds. Once established, it’s notably drought-tolerant, making it an excellent choice for water-wise landscaping in areas that receive minimal irrigation.

Perfect Garden Settings

Texan great ragweed shines in specific landscape contexts:

  • Prairie and meadow gardens
  • Wildlife habitat areas
  • Natural area restoration projects
  • Back-of-border plantings in informal gardens
  • Areas where you want to minimize maintenance

Planting and Establishment

Starting Texan great ragweed is typically done from seed, which can be direct-sown in fall or early spring. The seeds need light to germinate, so barely cover them with soil or simply press them into the surface. Being an annual, the plant will complete its life cycle in one season, but may self-seed in favorable conditions.

Once germinated, minimal care is required. Avoid fertilizing, as rich conditions can actually reduce the plant’s natural hardiness and ecological value.

The Bottom Line

Texan great ragweed isn’t for everyone, and that’s perfectly okay. If you’re creating a cottage garden or looking for showy blooms, there are countless other native options that might better suit your needs. However, if you’re passionate about supporting native ecosystems, restoring prairie habitats, or simply want a truly low-maintenance plant for challenging growing conditions, this humble native annual deserves consideration.

Remember, every native plant plays a role in the complex web of local ecology. Sometimes the most valuable plants are the ones that work quietly behind the scenes, supporting the wildlife and natural systems that make our landscapes truly vibrant and sustainable.

Texan Great Ragweed

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

Ambrosia L. - ragweed

Species

Ambrosia trifida L. - great ragweed

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