Quinoa

Sowing: Quinoa can be direct-sown into the field or started as transplants, and its seed germinates readily, often within the first week after sowing; sowing date itself has been shown to shape emergence, growth, and eventual grain yield. Plants grow rapidly through early summer, reaching several inches within weeks and standing three to six feet tall by maturity, with roughly 90 to 125 days needed after planting for the seed to fully develop; the plant prefers warm days paired with cool nights and does not develop properly when nights stay too warm.

Site: The crop tolerates a wide range of growing conditions, from as little as three inches of annual rainfall to as much as seventy-five, soils with a pH from 4.8 to 9.5, notable soil salinity, and hard frosts during both vegetative growth and flowering.

Watering: Supplemental irrigation has been observed to increase plant size and yield, though the crop can also mature on rainfall alone; fields have been fertilized with nitrogen and phosphorus during the growing season.

Quinoa seeds are coated in bitter-tasting saponins that act as a natural deterrent to birds and insect pests, a trait that lets many growers raise the crop without added pesticides.

Pests: Slugs can threaten young plantings, and growers have applied molluscicide bait alongside the seed at planting time to protect emerging seedlings.

Harvest: Seed on a single quinoa plant ripens unevenly, so the crop is traditionally harvested by hand to avoid the losses that mechanical harvesting causes on unevenly matured heads; a heavy rain arriving just as the crop reaches maturity can damage the standing seed heads, so timing the harvest to a dry spell matters.

Storage: After harvest the seeds are washed and milled to remove their bitter, saponin-coated outer layer before they are palatable; once processed, raw quinoa can be kept at room temperature in its original packaging until its best-by date.

Culinary: Quinoa seed is cooked much like rice, simmered in liquid until tender and used as a grain substitute in cereals, salads, stir-fries, and baked goods, or ground into flour, pressed into flakes, or popped like popcorn; because the plant is not a grass, it is naturally gluten-free. Its leaves, too, can be eaten fresh or cooked in the manner of its relative spinach.

Cultural: In the Andes quinoa has long been grown as a staple food, and the Inca held it sacred as the 'mother grain,' with the emperor traditionally sowing the first seeds of the season using a golden ceremonial spade.

Quinoa was domesticated for human food in the Andean region spanning present-day Argentina, Bolivia, Chile, Colombia, Ecuador, and Peru roughly three to five thousand years ago, with archaeological evidence pointing to an earlier, non-domesticated association with pastoral herding some five to seven thousand years ago; it may have been brought into cultivation before the grasses, making it among the earliest seed crops domesticated in the Americas.

Following the Spanish conquest, colonists favored European grains such as barley and oats over quinoa and, owing to its ties to Inca religious ceremony, at times suppressed its cultivation in favor of wheat; the crop nevertheless persisted as a staple of high-altitude Andean farming, and some of the best quality quinoa today still comes from those same high elevations.