How to Grow Smooth Pigweed
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Smooth Pigweed
Amaranthus laevigatus
vegetableAmaranthus laevigatus, commonly known as smooth pigweed or smooth amaranth, is a leafy green vegetable native to tropical regions. It produces tender, edible leaves and seeds that are highly nutritious and are consumed as a staple in many African, Asian, and Caribbean cuisines. The plant is drought-tolerant, fast-growing, and adapts well to warm climates.
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Example Smooth Pigweed timeline · Pittsburgh, PA (Zone 6b)
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Plant Smooth Pigweed
Around Apr 17Near Pittsburgh's average last spring frost.
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Tend & protect
Late spring–summerWatering, feeding, and pest-watch reminders.
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Harvest Smooth Pigweed
Around May 17≈ 30 days after planting
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Growing Conditions
Soil
Growing Zones
Find your zone →Thrives in warm tropical and subtropical zones 9-12; can be grown as a summer annual in cooler regions
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Get my Smooth Pigweed timeline →Growth Stages
Seedling
1-2 weeksTiny seedlings emerge with cotyledons and first true leaves appearing within 5-7 days. Plants are delicate and light green.
Keep soil warm (70-85°F) and moist. Provide bright light. Thin seedlings to proper spacing once they have 2-3 true leaves. Protect from strong winds.
Vegetative Growth
2-3 weeksPlant develops 4-6 true leaves and grows rapidly with increasing stem height and leaf production. Leaves are smooth, tender, and dark green.
Water regularly and deeply. Apply balanced fertilizer every 2-3 weeks or use side-dressing of compost. Remove any dead or yellowing leaves. Monitor for pests.
Young Harvest
2-4 weeksPlant reaches 6-12 inches tall with abundant tender leaves suitable for harvesting. Young leaves are most tender and nutritious.
Begin harvesting outer leaves or cut entire plant 1-2 inches above soil for regrowth. Harvest in early morning for best flavor and moisture content.
Flowering
3-4 weeksTall flower spikes develop at the top of the plant with dense clusters of tiny reddish, purple, or greenish flowers. Plant height reaches 18-36 inches.
Continue harvesting leaves below flowers if desired. For seed production, stop harvesting and allow flowers to fully develop and mature.
Seed Maturation & Harvest
2-3 weeksFlowers fade and seed heads dry to brown or reddish-brown color. Seeds are tiny (1-2mm), glossy, and contained within the dried flower bracts.
Allow seed heads to fully dry on the plant or cut and hang upside down in a warm, dry location. Seeds are ready when they fall easily from the bracts.
Common Pests
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Use row covers, neem oil spray, or insecticidal soap. Remove debris where adults overwinter.
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Spray with strong water stream, apply neem oil or insecticidal soap, or introduce natural predators like ladybugs.
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Increase humidity, spray with water, use neem oil or sulfur dust. Avoid excessive nitrogen fertilizer.
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Place collar barriers around seedlings, use Bacillus thuringiensis (Bt), handpick, or apply diatomaceous earth.
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Remove affected leaves, improve air circulation, water at soil level, apply copper fungicide if necessary.
Uses
Nutritious Leafy Green
CulinarySmooth pigweed leaves are cooked or eaten raw in salads and are a staple vegetable in African, Asian, and Caribbean cuisine. The leaves are rich in vitamins A, C, K, iron, and calcium, making them an excellent addition to any diet. [source]
Seed Grain
CulinaryThe tiny seeds are cooked as a grain, popped like popcorn, or ground into flour for baking. Amaranth seeds are complete proteins containing all nine essential amino acids. [source]
Traditional Health Remedy
MedicinalIn traditional medicine systems, amaranth leaves and seeds are used to address nutritional deficiencies, support blood health, and provide anti-inflammatory benefits due to their high nutrient density. [source]
Natural Dye Production
HouseholdThe reddish-purple pigments (betalains) in some amaranth varieties can be extracted and used as natural food coloring or textile dyes. [source]
Bird and Pollinator Food
WildlifeAmaranth flowers attract pollinators and the mature seed heads provide food for birds and beneficial insects in late summer and fall. [source]
This is not medical advice. LizPlants is not a medical resource. Always consult a qualified healthcare professional before using plants medicinally.
Harvest Tips
Harvest leaves when young and tender (30-50 days), using the 'cut-and-come-again' method by harvesting outer leaves or cutting the entire plant 1-2 inches above soil for regrowth. Multiple harvests are possible from a single plant. For seeds, allow the plant to mature fully, let seed heads dry completely on the plant or after cutting, then thresh and collect seeds in late summer/early fall.
Fun Facts
- 🌱 Amaranth was a sacred crop of the Aztecs and was used in ritual ceremonies; it has been cultivated for over 8,000 years.
- 🌱 A single amaranth plant can produce up to 500,000 tiny seeds, making it an incredibly prolific and efficient crop for food security in developing regions.
- 🌱 Amaranth is technically a pseudocereal (seed treated as a grain) rather than a true cereal, similar to quinoa and buckwheat, and is naturally gluten-free.
Gardening Terms
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