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North America Non-native Plant

Plainsman Amaranth

Plainsman Amaranth: A Colorful Annual for the Adventurous Gardener If you’re looking to add some serious vertical drama to your garden with minimal fuss, let me introduce you to Plainsman amaranth (Amaranthus hybridus × hypochondriacus). This striking annual might sound like it has an identity crisis with that hybrid name, ...

Plainsman Amaranth: A Colorful Annual for the Adventurous Gardener

If you’re looking to add some serious vertical drama to your garden with minimal fuss, let me introduce you to Plainsman amaranth (Amaranthus hybridus × hypochondriacus). This striking annual might sound like it has an identity crisis with that hybrid name, but trust me – it knows exactly what it’s doing in the garden!

What Exactly Is Plainsman Amaranth?

Plainsman amaranth is a hybrid cross between two amaranth species, creating a plant that combines the best traits of both parents. As an annual forb – basically a fancy way of saying it’s a non-woody herbaceous plant that completes its life cycle in one growing season – this beauty puts on quite a show before winter calls it quits.

The plant produces stunning, upright flower spikes that look like colorful feather dusters reaching toward the sky. These plumes come in eye-catching shades of red, purple, and green, making them absolute showstoppers in any garden bed.

Where Does It Come From?

This hybrid combines genetics from tropical American and Central Mexican ancestors, so it’s not native to North America. While it won’t help support your local ecosystem quite like native plants do, it’s also not considered invasive or problematic – it’s just a well-behaved garden visitor.

Why Grow Plainsman Amaranth?

Here’s why this plant might earn a spot in your garden:

  • Low maintenance: Once established, it’s surprisingly drought-tolerant and requires minimal care
  • Quick results: As an annual, it grows fast and provides almost instant gratification
  • Cutting garden gold: Those dramatic flower spikes make fantastic fresh or dried arrangements
  • Pollinator support: Bees and other insects appreciate the pollen-rich flowers
  • Bird magnet: The seeds that follow the flowers attract hungry songbirds
  • Vertical interest: Perfect for adding height and texture to annual beds

Growing Conditions and Care

Plainsman amaranth is refreshingly easy-going when it comes to growing requirements:

Sunlight: This sun-worshipper needs full sun to really strut its stuff. Give it at least 6-8 hours of direct sunlight daily.

Soil: Well-draining soil is key – it’s not picky about soil type but won’t tolerate soggy feet. Average garden soil works perfectly fine.

Climate: Being heat-loving, it thrives in warm weather and can be grown as an annual in USDA zones 2-11.

Planting and Care Tips

Getting started with Plainsman amaranth is almost foolishly simple:

  • Timing: Direct sow seeds after the last frost date when soil has warmed up
  • Spacing: Plant seeds about 12-18 inches apart, then thin seedlings as needed
  • Watering: Regular watering while establishing, then it becomes quite drought-tolerant
  • Fertilizing: Generally unnecessary – too much fertilizer can actually reduce flower production
  • Maintenance: Minimal care required once growing; may self-seed for next year

Garden Design Ideas

Plainsman amaranth works beautifully in cottage gardens, cutting gardens, and naturalized areas where its informal charm can shine. Use it as a backdrop for shorter annuals or let it create dramatic focal points in mixed borders. It’s particularly stunning when planted in masses for maximum visual impact.

Consider Native Alternatives

While Plainsman amaranth is a lovely garden addition, consider incorporating native alternatives that provide similar benefits while supporting local ecosystems. Look into native amaranth species in your region, or explore other native annuals with showy flower spikes like native sunflowers or native grasses.

Whether you choose Plainsman amaranth or its native cousins, you’ll be rewarded with a plant that proves sometimes the most striking garden additions are also the easiest to grow. Happy gardening!

Plainsman 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 hybridus × hypochondriacus [unnamed hybrid] - Plainsman amaranth

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