• Photo of Amaranthus retroflexus (Amaranthus retroflexuss)

Plant Profile: Amaranthus retroflexus

Taxonomy: Amaranthus retroflexus

Names

Careless Weed, Common Amaranth, Common Tumbleweed, Pigweed, Pigweed Amaranth, Red Root Amaranth, Red-Root Amaranth, Redroot Amaranth, Red Root Pigweed, Red-Root Pigweed, Redroot Pigweed, Rough Pigweed, Wild Beet Amaranth

  • Photo of Amaranthus retroflexus (Amaranthus retroflexuss)

Phonetic Spelling:am-a-RAN-thus ret-roh-FLEKS-us

Genus:Amaranthus

Species:retroflexus

Family:Amaranthaceae

Pigweed, a summer annual belonging to the Amaranthaceae family, is characterized by its multiple stems. Often regarded as a weed, it thrives in a variety of environments, including wastelands, prairies, uncultivated fields, agricultural lots, rocky terrains, and cultivated areas. Its aggressive growth can lead to reduced yields in numerous vegetable crops. The plant typically grows with few branches or may remain unbranched altogether.

The seeds of pigweed are edible and can be consumed either raw or cooked. They are occasionally ground into a powder to serve as a cereal substitute, and the sprouts can enhance salads. Despite some edible parts, the plant is harmful to livestock such as pigs, cattle, sheep, goats, and horses.

This particular type of pigweed stands out from other common weeds in its family due to its distinct appearance, marked by a shorter and sturdier growth pattern. It typically flowers between July and September, with seeds maturing from August to October. Pollination primarily occurs through wind.

Interestingly, this plant does not attract insects that cause damage, making it relatively resilient against pests.

Amaranthus retroflexus Feature Summary

Amaranthus retroflexus Image Gallery

Tags

#drought tolerant
#weed
#weedy
#summer annual weed
#edible seeds
#edible leaves
#wind pollinated
#edible
#warm season weed

Similar Plants

Amaranthus retroflexus is often confused with:

Amaranthus retroflexus Feature Summary

Attributes
The seeds may be eaten, raw or cooked, ground into a flour, or sprouted. The young leaves are also edible.
Central and Eastern North America
This plant is now found nearly worldwide as an introduced plant.
A food source for birds, butterflies, moths, insects and small mammals.
The seeds may be eaten raw, or toasted. They can also be sprouted. Ground seeds can be used as a cereal. Young leaves may be eaten raw or cooked.
Wildlife Food Source
Attracts Pollinators
Fruit
One glossy black to dark reddish brown seed is revealed when the bladder-like capsule splits, circumferentially, at maturity. As many as 117,000 seeds can be produced per plant.
Capsule
Achene
Cream/Tan
Flowers
Numerous, small, green monoecious flowers with prominent bracts that are longer than their tepals. Flowers clustered in spikes on panicles.
White
Green
4-5 petals/rays
> 6 inches
Leaves
The leaves are smaller in the upper portion of the central stem. Each leaf base is rounded, the tip can be acute, obtuse, emarginate, or rounded.. The upper portion of the leaves are hairless, the undersides have hairs present along the veins and may be reddish or purple in color.
Green
Red/Burgundy
Elliptical
Ovate
Cordate
Rhomboidal
Entire
Undulate
3-6 inches
3-6 inches
Stem
The central stem is stout, rounded, veined and covered with white hairs. The stems are reddish near the base of the plant.
Green
Red/Burgundy
Hairy (pubescent)
Straight
Poisonous to Humans
Nitrate poisoning in horses and ruminants is characterized by a bluish cast to the mucous membranes, respiratory distress, weakness and trembling. High oxalate ingestion can result in kidney failure.
Pigweeds accumulate nitrates, which can lead to nitrate poisoning in grazing animals such as horses and ruminants. Levels may b
Leaves
Stems
Whole Plant Traits
Cultural Conditions
Full sun (6 or more hours of direct sunlight a day)
Neutral (6.0-8.0)
Good Drainage
Moist
Coastal
Mountains
Piedmont
4a
4b
5b
5a
6a
6b
7a
7b
8b
8a
3a
3b
9a
9b
10a
10b
11a
11b
Clay
Loam (Silt)
Sand
Landscape
Edible Garden
Pollinator Garden
Woodland
Meadow
Slope/Bank
Coastal
Songbirds
Small Mammals
Problem for Horses
Weedy

Amaranthus retroflexus Attributes

Amaranthus retroflexus: Uses (Ethnobotany)

The seeds may be eaten, raw or cooked, ground into a flour, or sprouted. The young leaves are also edible.

Amaranthus retroflexus: Country Or Region Of Origin

Central and Eastern North America

Amaranthus retroflexus: Distribution

This plant is now found nearly worldwide as an introduced plant.

Amaranthus retroflexus: Wildlife Value

A food source for birds, butterflies, moths, insects and small mammals.

Amaranthus retroflexus: Edibility

The seeds may be eaten raw, or toasted. They can also be sprouted. Ground seeds can be used as a cereal. Young leaves may be eaten raw or cooked.

Amaranthus retroflexus: Life Cycle

Annual
Biennial
Bulb
Perennial
Woody

Amaranthus retroflexus: Recommended Propagation Strategy

Division
Grafting
Layering
Leaf Cutting
Root Cutting
Seed
Stem Cutting

Amaranthus retroflexus: Play Value

Attractive Flowers
Attracts Pollinators
Buffer
Colorful
Defines Paths
Easy to Grow
Edible fruit
Fragrance
Pieces Used in Games
Screening
Shade
Sound
Textural
Wildlife Cover/Habitat
Wildlife Food Source
Wildlife Larval Host
Wildlife Nesting
Wind Break
Wind Shimmer

Amaranthus retroflexus Fruit

Amaranthus retroflexus: Fruit Description

One glossy black to dark reddish brown seed is revealed when the bladder-like capsule splits, circumferentially, at maturity. As many as 117,000 seeds can be produced per plant.

Amaranthus retroflexus: Fruit Type

Achene
Aggregate
Berry
Capsule
Caryopsis
Drupe
Follicle
Legume
Nut
Pome
Samara
Schizocarp
Siliqua

Amaranthus retroflexus: Fruit Color

grass
Cream/Tan

Amaranthus retroflexus: Fruit Value To Gardener

Edible
Fragrant
Good Cut
Good Dried
Long Bloom Season
Long-lasting
Showy

Amaranthus retroflexus: Display/Harvest Time

Fall
Spring
Summer
Winter

Amaranthus retroflexus: Fruit Length

< 1 inch
1-3 inches
> 3 inches

Amaranthus retroflexus Flowers

Amaranthus retroflexus: Flower Description

Numerous, small, green monoecious flowers with prominent bracts that are longer than their tepals. Flowers clustered in spikes on panicles.

Amaranthus retroflexus: Flower Color

filter_vintage
Green
filter_vintage
White

Amaranthus retroflexus: Flower Inflorescence

Catkin
Corymb
Cyme
Head
Insignificant
Panicle
Raceme
Solitary
Spadix
Spike
Umbel

Amaranthus retroflexus: Flower Bloom Time

Winter
Spring
Summer
Fall

Amaranthus retroflexus: Flower Petals

2-3 rays/petals
4-5 petals/rays
6 petals/rays
7 - 20 petals/rays
asymmetrical petals
Bracts
Colored Sepals
fused petals
more than 20 petals/rays
Tepals

Amaranthus retroflexus: Flower Size

1-3 inches
3-6 inches
< 1 inch
> 6 inches

Amaranthus retroflexus Leaves

Amaranthus retroflexus: Leaf Description

The leaves are smaller in the upper portion of the central stem. Each leaf base is rounded, the tip can be acute, obtuse, emarginate, or rounded.. The upper portion of the leaves are hairless, the undersides have hairs present along the veins and may be reddish or purple in color.

Amaranthus retroflexus: Woody Plant Leaf Characteristics

Broadleaf Evergreen
Deciduous
Needled Evergreen
Semi-evergreen

Amaranthus retroflexus: Leaf Color

spa
Green
spa
Red/Burgundy

Amaranthus retroflexus: Leaf Type

Compound (Pinnately , Bipinnately, Palmately)
Fronds
Needles
Sheath
Simple

Amaranthus retroflexus: Leaf Arrangement

Alternate
Opposite
Other/more complex
Rosulate
Whorled

Amaranthus retroflexus: Leaf Shape

Acicular
Auriculate
Cordate
Cuneate
Deltoid
Elliptical
Filiform
Lanceolate
Linear
Oblanceolate
Oblong
Obovate
Obtuse
Orbicular
Ovate
Palmasect
Palmatifid
Peltate
Pinnatifid
Pinnatisect
Reniform
Rhomboidal
Spatulate
Subcordate
Subulate

Amaranthus retroflexus: Leaf Margin

Crenate
Crenulate
Dentate
Denticulate
Doubly Crenate
Doubly Dentate
Doubly Serrate
Entire
Lobed
Serrate
Sinuate
Undulate

Amaranthus retroflexus: Hairs Present

No
Yes

Amaranthus retroflexus: Leaf Length

< 1 inch
1-3 inches
3-6 inches
> 6 inches

Amaranthus retroflexus: Leaf Feel

Fleshy
Glossy
Leathery
Papery
Prickly
Rough
Rubbery
Slippery
Smooth
Soft
Velvety
Waxy

Amaranthus retroflexus: Leaf Value To Gardener

Edible
Fragrant
Good Cut
Good Dried
Long-lasting
Showy

Amaranthus retroflexus: Leaf Width

< 1 inch
1-3 inches
3-6 inches
> 6 inches

Amaranthus retroflexus Stem

Amaranthus retroflexus: Stem Description

The central stem is stout, rounded, veined and covered with white hairs. The stems are reddish near the base of the plant.

Amaranthus retroflexus: Stem Color

grass
Green
grass
Red/Burgundy

Amaranthus retroflexus: Stem Is Aromatic

No
Yes

Amaranthus retroflexus: Stem Cross Section

Angular
Oval
Round
Square

Amaranthus retroflexus: Stem Surface

Corky Ridges
Covered with a powdery bloom (glaucous)
Dull
Hairy (pubescent)
Polished
Smooth (glabrous)

Amaranthus retroflexus: Stem Form

Straight
Zig Zags

Amaranthus retroflexus Poisonous to Humans

Amaranthus retroflexus: Poison Symptoms

Nitrate poisoning in horses and ruminants is characterized by a bluish cast to the mucous membranes, respiratory distress, weakness and trembling. High oxalate ingestion can result in kidney failure.

Amaranthus retroflexus: Poison Toxic Principle

Pigweeds accumulate nitrates, which can lead to nitrate poisoning in grazing animals such as horses and ruminants. Levels may b

Amaranthus retroflexus: Poison Severity

High
Low
Medium

Amaranthus retroflexus: Causes Contact Dermatitis

No
Yes

Amaranthus retroflexus: Poison Part

Bark
Flowers
Fruits
Leaves
Roots
Sap/Juice
Seeds
Stems

Amaranthus retroflexus Whole Plant Traits

Amaranthus retroflexus: Plant Type

Annual
Bulb
Carnivorous
Edible
Epiphyte
Fern
Ground Cover
Herb
Herbaceous Perennial
Houseplant
Mushroom
Native Plant
Ornamental Grasses and Sedges
Perennial
Poisonous
Rose
Shrub
Succulent
Tree
Turfgrass
Vegetable
Vine
Water Plant
Weed
Wildflower

Amaranthus retroflexus: Woody Plant Leaf Characteristics

Broadleaf Evergreen
Deciduous
Needled Evergreen
Semi-evergreen

Amaranthus retroflexus: Habit/Form

Arching
Ascending
Broad
Cascading
Climbing
Clumping
Columnar
Conical
Creeping
Dense
Erect
Horizontal
Irregular
Mounding
Multi-stemmed
Multi-trunked
Open
Oval
Prostrate
Pyramidal
Rounded
Spreading
Vase
Weeping

Amaranthus retroflexus: Growth Rate

Slow
Medium
Rapid

Amaranthus retroflexus: Maintenance

Low
Medium
High

Amaranthus retroflexus: Texture

Fine
Medium
Coarse

Amaranthus retroflexus Cultural Conditions

Amaranthus retroflexus: Light

Dappled Sunlight (Shade through upper canopy all day)
Deep shade (Less than 2 hours to no direct sunlight)
Full sun (6 or more hours of direct sunlight a day)
Partial Shade (Direct sunlight only part of the day, 2-6 hours)

Amaranthus retroflexus: Soil pH

Acid (<6.0)
Alkaline (>8.0)
Neutral (6.0-8.0)

Amaranthus retroflexus: Soil Drainage

Frequent Standing Water
Good Drainage
Moist
Occasional Flooding
Occasionally Dry
Occasionally Wet
Very Dry

Amaranthus retroflexus: Available Space To Plant

12 inches-3 feet
12-24 feet
24-60 feet
3 feet-6 feet
6-feet-12 feet
Less than 12 inches
more than 60 feet

Amaranthus retroflexus: NC Region

Coastal
Mountains
Piedmont

Amaranthus retroflexus: USDA Plant Hardiness Zone

thermostat
10a
thermostat
10b
thermostat
11a
thermostat
11b
thermostat
3a
thermostat
3b
thermostat
4a
thermostat
4b
thermostat
5a
thermostat
5b
thermostat
6a
thermostat
6b
thermostat
7a
thermostat
7b
thermostat
8a
thermostat
8b
thermostat
9a
thermostat
9b

Amaranthus retroflexus: Soil Texture

Clay
High Organic Matter
Loam (Silt)
Sand
Shallow Rocky

Amaranthus retroflexus Landscape

Amaranthus retroflexus: Landscape Theme

Asian Garden
Butterfly Garden
Children's Garden
Cottage Garden
Cutting Garden
Drought Tolerant Garden
Edible Garden
English Garden
Fairy Garden
Garden for the Blind
Native Garden
Nighttime Garden
Pollinator Garden
Rain Garden
Rock Garden
Shade Garden
Water Garden
Winter Garden

Amaranthus retroflexus: Landscape Location

Coastal
Container
Hanging Baskets
Houseplants
Lawn
Meadow
Naturalized Area
Near Septic
Patio
Pond
Pool/Hardscape
Recreational Play Area
Riparian
Rock Wall
Slope/Bank
Small Space
Vertical Spaces
Walkways
Woodland

Amaranthus retroflexus: Attracts

Bats
Bees
Butterflies
Frogs
Hummingbirds
Moths
Pollinators
Predatory Insects
Reptiles
Small Mammals
Songbirds
Specialized Bees

Amaranthus retroflexus: Problems

Allelopathic
Contact Dermatitis
Frequent Disease Problems
Frequent Insect Problems
Invasive Species
Malodorous
Messy
Poisonous to Humans
Problem for Cats
Problem for Children
Problem for Dogs
Problem for Horses
Short-lived
Spines/Thorns
Weak Wood
Weedy