Also known as American Pigweed · Carelessweed · Common Amaranth
Amaranthus retroflexus is a vigorous annual weed with a deep red taproot, known for its prolific seed production and widespread distribution.
At-a-glance light, water, soil, and growing conditions from plant data
Full Sun
100% intensity
Requires at least 6-8 hours of direct sunlight daily.
Moderate
50% intensity
Keep soil consistently moist but not waterlogged.
Adaptable, prefers well-drained
50% intensity
Warm
75% intensity
Prefers warm temperatures; sensitive to frost.
Heavy Feeder
75% intensity
Benefits from nutrient-rich soil and regular feeding.
Safety information from plant toxicity data
| Attribute | Value |
|---|---|
| Toxic for humans | No 0/5 intensity |
| Toxic for pets | No 0/5 intensity |
| Edible | Yes |
None
Key traits and growing stats from plant data
Watering, pruning, propagation, and repotting details from plant data
Amaranthus retroflexus thrives in consistently moist soil, especially during its establishment phase. Water deeply when the top 2-3 cm of soil feels dry. Avoid waterlogged conditions, which can lead to root rot.
Once established, it exhibits moderate drought tolerance but benefits from regular watering during dry spells.
Pruning is generally not required for Amaranthus retroflexus, as it is an annual that completes its life cycle in one season. If managing size or preventing excessive seeding is necessary, light pruning can be done.
Remove any dead or damaged foliage to maintain a tidy appearance.
Amaranthus retroflexus is easily grown from seed. Sow seeds directly into the garden after the last frost, or start them indoors 4-6 weeks prior to the last frost date.
Seeds require light to germinate, so sow them on the surface of the soil and press down gently.
Repotting is not typically necessary for Amaranthus retroflexus as it is an annual plant.
If started indoors, seedlings can be transplanted into larger pots as they grow, or directly into the garden when outdoor conditions are favorable. Ensure adequate space for root development.
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Monthly activity intensity for bloom and fruit across both hemispheres.
Flowering & fruiting calendar
Flowering & fruiting calendar
Photos of Redroot Amaranth (Amaranthus retroflexus)
Common names and botanical synonyms
Botanical classification
| Rank | Name |
|---|---|
| Kingdom | Plantae |
| Division | Tracheophyta |
| Class | Magnoliopsida |
| Order | Caryophyllales |
| Family | Amaranthaceae |
| Genus | Amaranthus |
| Species | Amaranthus retroflexus |
Similar in genus Amaranthus
Answers based on plant encyclopedia data
