Amaranthus Species, Needle Burr, Spiny Amaranth, Thorny Pigweed

Amaranthusspinosus

Genus
Amaranthus (am-uh-RANTH-us)
Species
spinosus (spy-NO-sus)
Synonym
Amaranthus caracasanus
Amaranthus coracanus
Sun Exposure
Full Sun
Foliage
Herbaceous
Smooth
Height
18-24 in. (45-60 cm)
24-36 in. (60-90 cm)
Spacing
15-18 in. (38-45 cm)
Hardiness
Not Applicable
Danger
Plant has spines or sharp edges; use extreme caution when handling
Bloom Color
White/Near White
Bloom Time
Late Spring/Early Summer
Mid Summer
Late Summer/Early Fall
Other Details
Category
Annuals
Water Requirements
Average Water Needs; Water regularly; do not overwater
Foliage Color
Where to Grow
Bloom Characteristics
This plant is attractive to bees, butterflies and/or birds
Bloom Size
Other details
May be a noxious weed or invasive
Soil pH requirements
6.1 to 6.5 (mildly acidic)
6.6 to 7.5 (neutral)
7.6 to 7.8 (mildly alkaline)
Patent Information
Non-patented
Propagation Methods
From seed; direct sow outdoors in fall
From seed; sow indoors before last frost
From seed; direct sow after last frost
Self-sows freely; deadhead if you do not want volunteer seedlings next season
Seed Collecting
Bag seedheads to capture ripening seed
Collect seedhead/pod when flowers fade; allow to dry
Regional

This plant is said to grow outdoors in the following regions:

Bartow, Florida

Zephyrhills, Florida

Hinsdale, Illinois

Benton, Kentucky

Newfield, New Jersey

Granville, Ohio

Geronimo, Texas

Weyers Cave, Virginia

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Gardener's Notes:

2
positives
0
neutral
4
negatives
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B
Geronimo, TX | September 2013 | negative

I marked as 'having' this plant, but it would be just fine by me if I didn't. This is a weed in every sense of the word -- grows everywh...Read More

T
Mantua, OH (Zone 5a) | November 2012 | negative

Grow many types of amaranths here in northern Ohio.This one appeared in with my amaranths this summer. It looked similar at beginning gr...Read More

R
Moulton, IA | July 2009 | negative

I HATE this plant! It's the worst pain in the crotch to pull and deal with. It comes up, and doesn't stop. Constant weeding and weed wh...Read More

Z
Z
Shenandoah Valley, VA (Zone 6b) | February 2009 | negative

Sooo.... this plant loves compact soil, loose fertile soil, any soil. And it's a complete thug. Contact with its bejillion thorns is init...Read More

L
Granville, OH (Zone 6a) | August 2007 | positive

Native to tropical regions of the New World, Amaranthus spinosus is now an introduced weed in many areas far outside its original range. ...Read More

M
Erwin, TN (Zone 7a) | November 2003 | positive

This has the same uses as common Amaranth but the thorns are very sharp and leaf collecting for food or medicine should be done carefully...Read More

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