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North America Non-native Plant

Smooth Joyweed

Smooth Joyweed: What You Need to Know About This Uncommon Plant If you’ve stumbled across the name smooth joyweed in your plant research, you’re looking at quite the botanical puzzle piece. Alternanthera paronychioides var. amazonica is one of those plants that keeps a low profile in the gardening world, and ...

Smooth Joyweed: What You Need to Know About This Uncommon Plant

If you’ve stumbled across the name smooth joyweed in your plant research, you’re looking at quite the botanical puzzle piece. Alternanthera paronychioides var. amazonica is one of those plants that keeps a low profile in the gardening world, and for good reason – there’s not a whole lot of information floating around about this particular variety.

The Basics: What Is Smooth Joyweed?

Smooth joyweed is a perennial forb, which is just a fancy way of saying it’s a non-woody herbaceous plant that comes back year after year. Think of it as the plant equivalent of that quiet neighbor you rarely see but know is there. It belongs to the amaranth family and has made its way into Louisiana’s plant communities, though it’s not originally from North America.

Where You’ll Find It

Currently, this variety of smooth joyweed has been documented in Louisiana, where it has established itself and reproduces without human intervention. It’s one of those introduced species that has found a way to make itself at home in its new environment.

Should You Plant Smooth Joyweed?

Here’s where things get a bit tricky. While smooth joyweed isn’t flagged as invasive or particularly problematic, the lack of detailed information about its growing habits, ecological impact, and garden performance makes it a bit of a wild card for home gardeners.

Since this plant isn’t native to North America, and given the limited information available about its specific needs and behaviors, you might want to consider some alternatives that offer more predictable results and better ecological benefits.

Better Native Alternatives

If you’re drawn to the idea of adding interesting forbs to your Louisiana garden, consider these native options instead:

  • Wild bergamot (Monarda fistulosa) – great for pollinators
  • Purple coneflower (Echinacea purpurea) – beautiful and wildlife-friendly
  • Lanceleaf coreopsis (Coreopsis lanceolata) – cheerful yellow blooms
  • Blue mistflower (Conoclinium coelestinum) – excellent fall pollinator plant

The Mystery Factor

Part of what makes smooth joyweed so intriguing is also what makes it challenging for gardeners – we simply don’t know enough about this particular variety. Without clear information about its growing conditions, hardiness zones, care requirements, or potential benefits to wildlife, it’s like buying a mystery plant and hoping for the best.

Making the Right Choice for Your Garden

When it comes to gardening, especially native and ecological gardening, knowledge is power. Since we can’t tell you exactly how smooth joyweed will perform in your garden, what conditions it prefers, or what kind of maintenance it needs, it might be wise to stick with better-documented plants that can reliably contribute to your local ecosystem.

If you do encounter this plant growing wild, take a moment to observe it – you might be looking at a species that could use more research and documentation. But for your home garden, there are plenty of well-understood native alternatives that will give you beautiful results while supporting local wildlife.

Remember, every plant choice is a vote for the kind of ecosystem you want to support. When in doubt, go native – your local pollinators, birds, and soil microbes will thank you for it!

Smooth Joyweed

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

Alternanthera Forssk. - joyweed

Species

Alternanthera paronychioides A. St.-Hil. - smooth joyweed

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