Redroot pigweed
Amaranthus retroflexus · Amaranthaceae
The gardener's calendar
Ideal time to plant redroot pigweed: set it out when the soil is neither frozen nor waterlogged, and water generously as it establishes.
ID card
- Foliage
- Deciduous, green to reddish depending on varieties
- Flowering
- Summer to fall (July to October)
- Adult size
- 0.5 to 1.5 m in height
- Growth
- Fast
- Hardiness
- Annual, frost-tender
- Origin
- North and Central America
- Soil type
- Undemanding, tolerates poor to average soils
Care
Light
Reflected amaranth prefers a full sun location for optimal growth and intense coloring. However, it tolerates partially sunny exposures, although with reduced vigor. Avoid overly shaded areas that would weaken the plant.
Watering
Water regularly at the beginning of the season and during dry periods, keeping the soil slightly moist. Once established, amaranth is relatively drought-tolerant. Reduce watering in fall. Avoid waterlogging which promotes rot.
Soil and planting
Reflected amaranth adapts to most soils, even poor or compacted ones. Proper drainage is preferable. Sow directly in place after the last frosts, thinning young seedlings. Slightly fertile soil accelerates growth but is not essential.
Fertilization
This plant does not need abundant fertilizer. A moderate application of balanced fertilizer at the start of growth is generally sufficient. For very poor soils, well-decomposed compost at planting time will provide basic nutrients.
Pruning and pinching
No pruning is strictly necessary. Early pinching of young plants promotes denser branching and a more compact shape. Remove faded flowers to encourage prolonged flowering if desired.
Diseases and pests
Reflected amaranth is generally robust. Watch for powdery mildew in humid, warm conditions: ensure good air circulation. Young seedlings can be affected by slugs at the seedling stage. Chemical treatment is not usually necessary in amateur gardening.
Did you know?
Reflected amaranth, although often considered an invasive weed in modern agriculture, was a sacred plant and major food source among the Aztecs, who named it 'huautli'. Its tiny but nutritious seeds can be roasted or ground into flour, linking this humble plant to a millennia-old history of cultural and nutritional importance.
Where to buy it
Plant in spring or early autumn, avoiding spells of intense heat. Pick a plant with healthy foliage and roots that are not exposed. Best time: March, April, May, September.
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Tips generated and checked by Viridia — adapt them to your local climate.