North America Native Plant

Gregg’s Amaranth

Botanical name: Amaranthus greggii

USDA symbol: AMGR2

Life cycle: annual

Habit: forb

Native status: Native to the lower 48 states  

Synonyms: Amaranthus annectens S.F. Blake (AMAN)  âš˜  Amaranthus myrianthus Standl. (AMMY)   

Gregg’s Amaranth: A Humble Native Worth Considering If you’re looking for a low-key native plant that won’t steal the show but will quietly do its job in your garden, meet Gregg’s amaranth (Amaranthus greggii). This unassuming annual forb might not win any beauty contests, but it has some solid credentials ...

Gregg’s Amaranth: A Humble Native Worth Considering

If you’re looking for a low-key native plant that won’t steal the show but will quietly do its job in your garden, meet Gregg’s amaranth (Amaranthus greggii). This unassuming annual forb might not win any beauty contests, but it has some solid credentials as a true native of the American South.

What Is Gregg’s Amaranth?

Gregg’s amaranth is an annual forb—basically a non-woody plant that completes its entire life cycle in one growing season. Unlike some of its flashier amaranth cousins, this species keeps things simple with small, greenish flowers arranged in dense clusters. It’s the kind of plant that gardeners either overlook entirely or appreciate for its understated contribution to native ecosystems.

Where Does It Call Home?

This native species has a pretty specific address: Louisiana and Texas. That’s it—just two states in the south-central United States where it naturally occurs. If you live in these areas, you’re looking at a true local native that evolved alongside your regional ecosystem.

Why You Might Want to Grow It

Let’s be honest—Gregg’s amaranth isn’t going to be the star of your garden. But here’s why it might deserve a spot anyway:

  • True regional native: If you’re in Louisiana or Texas, this plant has been part of your local ecosystem for thousands of years
  • Low maintenance: As an annual that’s adapted to local conditions, it typically requires minimal care
  • Flexible habitat needs: With a facultative wetland status, it can handle both wet and dry conditions
  • Supporting local biodiversity: Native plants often provide food and habitat for local wildlife, even if the specific benefits aren’t well-documented

Where It Fits in Your Landscape

Gregg’s amaranth works best in naturalized areas, native plant gardens, or prairie restoration projects. It’s not the plant you’d feature in a formal flower bed, but it can add authentic local character to wildflower meadows or areas where you want to recreate natural plant communities.

Think of it as a supporting actor rather than the leading role—it helps create the full picture of a native landscape without demanding attention.

Growing Conditions and Care

Since specific growing requirements for Gregg’s amaranth aren’t well-documented, we can make educated guesses based on its native habitat and family characteristics:

  • USDA Hardiness Zones: Likely zones 8-10, matching its native range
  • Light: Probably prefers full sun, like most amaranths
  • Soil: Likely adaptable to various soil types, potentially drought-tolerant once established
  • Water: Its facultative wetland status suggests it can handle both moist and drier conditions

Planting and Propagation

As an annual, Gregg’s amaranth likely grows from seed each year. While specific propagation information isn’t readily available, most amaranths are straightforward to grow from seed sown directly in the garden in spring after the last frost.

Should You Plant It?

If you live in Louisiana or Texas and you’re creating a native plant garden or naturalized area, Gregg’s amaranth could be a worthwhile addition to your plant palette. It won’t provide dramatic color or architectural interest, but it will contribute to the authentic character of a regional native landscape.

However, if you’re looking for showy flowers or dramatic foliage, you might want to consider other native options that offer more visual impact while still supporting local ecosystems.

For gardeners outside of Louisiana and Texas, this species wouldn’t be appropriate since it’s not native to your region. Instead, look for amaranth species that are native to your specific area.

The Bottom Line

Gregg’s amaranth is what you might call a plant nerd’s plant—appreciated more for its ecological authenticity than its garden glamour. If you’re passionate about growing true regional natives and creating habitat that reflects your local natural heritage, it deserves consideration. Just don’t expect it to wow your neighbors with flashy blooms!

Wetland Status

The rule of seasoned gardeners and landscapers is to choose the "right plant for the right place" matching plants to their ideal growing conditions, so they'll thrive with less work and fewer inputs. But the simplicity of this catchphrase conceals how tricky plant selection is. While tags list watering requirements, there's more to the story.

Knowing a plant's wetland status can simplify the process by revealing the interaction between plants, water, and soil. Surprisingly, many popular landscape plants are wetland species! And what may be a wetland plant in one area, in another it might thrive in drier conditions. Also, it helps you make smarter gardening choices and grow healthy plants with less care and feeding, saving you time, frustration, and money while producing an attractive garden with greater ecological benefits.

Regions
Status
Moisture Conditions

Atlantic and Gulf Coastal Plain

FAC

Facultative - Plants with this status can occur in wetlands and non-wetlands

Great Plains

FAC

Facultative - Plants with this status can occur in wetlands and non-wetlands

Gregg’s Amaranth

Classification

Group

Dicot

Kingdom

Plantae - Plants

Subkingdom

Tracheobionta - Vascular plants

Superdivision

Spermatophyta - Seed plants

Division

Magnoliophyta - Flowering plants

Subdivision
Class

Magnoliopsida - Dicotyledons

Subclass

Caryophyllidae

Order

Caryophyllales

Family

Amaranthaceae Martinov - Amaranth family

Genus

Amaranthus L. - pigweed

Species

Amaranthus greggii S. Watson - Gregg's amaranth

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