Amaranthus Species, Giant Amaranth, Pigweed, Southern Amaranth, Water Hemp

Amaranthusaustralis

Genus
Amaranthus (am-uh-RANTH-us)
Species
australis (aw-STRAL-iss)
Synonym
Acnida alabamensis
Acnida australis
Acnida cuspidata
Sun Exposure
Sun to Partial Shade
Height
6-8 ft. (1.8-2.4 m)
8-10 ft. (2.4-3 m)
10-12 ft. (3-3.6 m)
Hardiness
USDA Zone 8b: to -9.4 °C (15 °F)
USDA Zone 9a: to -6.6 °C (20 °F)
USDA Zone 9b: to -3.8 °C (25 °F)
USDA Zone 10a: to -1.1 °C (30 °F)
USDA Zone 10b: to 1.7 °C (35 °F)
USDA Zone 11: above 4.5 °C (40 °F)
Danger
N/A
Bloom Color
Pale Yellow
Bloom Time
Blooms all year
Other Details
Category
Biennials
Perennials
Water Requirements
Average Water Needs; Water regularly; do not overwater
Requires consistently moist soil; do not let dry out between waterings
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
Patent Information
Non-patented
Propagation Methods
From herbaceous stem cuttings
From seed; direct sow after last frost
Seed Collecting
Regional

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

Tuskegee, Alabama

Alachua, Florida

Apopka, Florida

Carrollton, Georgia

Trout, Louisiana

Trenton, New Jersey

Austin, Texas

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Gardener's Notes:

1
positive
3
neutrals
0
negative
Sort By:
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S
Tuskegee, AL (Zone 8a) | December 2012 | positive

Southern amaranth is native here. It sometimes wanders into my vegetable garden, but it's easy to pull, and, after its long tap root brin...Read More

M
Apopka, FL | August 2012 | neutral

This plant is HUGE and loves damp, rich soil. The stem is usually hollow. The plant is so tall it stands out amongst all other plants a...Read More

C
Alachua, FL (Zone 8b) | March 2011 | neutral

This grows wild in my area around Gainesville Fl. Does anyone know if it is edible (seeds or leaves) or have any information indicating ...Read More

F
Lutz, FL (Zone 9b) | January 2005 | neutral

Herbaceous, short-lived perennial with a stout stem that grows to about 1 foot tall. The leaves are alternate on long red or green petiol...Read More

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