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How to Grow Quinoas | Complete Growing Guide

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Quinoa (Chenopodium quinoa)

Tall rows of quinoa plants growing in a field — “Productive quinoa real plant” by Michael Hermann is licensed under CC BY-SA 4.0. Source: Wikimedia Commons

6 sources cited · Verified

The short answer

Site
soil pH 5.5–8
Biggest risk
Quinoa downy mildew

Quinoas (Chenopodium quinoa) — annual.

Core growing advice on this page is checked against named horticultural and university-extension sources — see References.

At a Glance

Mature golden-red quinoa seed heads ready for harvest — “Quinoa growing on Isla del Sol, Lake Titicaca” by Bob Ramsak is licensed under CC BY-SA 4.0. Source: Wikimedia Commons
“Quinoa growing on Isla del Sol, Lake Titicaca” by Bob Ramsak is licensed under CC BY-SA 4.0. Source: Wikimedia Commons.
Chenopodium quinoa Quinoa Quinoa downy mildew Aphids Lygus bug DISEASES PESTS

Quick Facts

Tall rows of quinoa plants growing in a field — “Productive quinoa real plant” by Michael Hermann is licensed under CC BY-SA 4.0. Source: Wikimedia Commons
“Productive quinoa real plant” by Michael Hermann is licensed under CC BY-SA 4.0. Source: Wikimedia Commons.
Factor Value
Soil pH 5.5 - 8
Optimal growing temp 14-18C
Minimum survivable temp -8C
Drainage Chalk, Loam, Sand; moist but well-drained or well-drained; low-nitrogen soils preferred (high-N promotes leafiness over seed production)
Lifecycle annual
Edible parts seeds

Soil & Growing Conditions

A deep red flowering quinoa plant — “QUINUA REAL variedad sin identificar (3) UYUNI-POTOSÍ” by PeñayLillo is licensed under CC BY-SA 4.0. Source: Wikimedia Commons
“QUINUA REAL variedad sin identificar (3) UYUNI-POTOSÍ” by PeñayLillo is licensed under CC BY-SA 4.0. Source: Wikimedia Commons.

Soil pH range

5.5 8

Span reflects genuine variation between the cited authorities, not a single agreed figure.

Growth Stages

Purple quinoa flower heads growing in a field — “Red quinoa plants” by Michael Hermann is licensed under CC BY-SA 4.0. Source: Wikimedia Commons
“Red quinoa plants” by Michael Hermann is licensed under CC BY-SA 4.0. Source: Wikimedia Commons.
Stage BBCH Notes
Sowing 0 Propagate by seed; seedlings do poorly in cold conditions, so delay planting out from seed trays until after the last spring frost (RHS, Homes and Gardens).
Leaf growth 3 Grows quickly upright to 1.5-2.5m tall, in full sun -- cannot grow in shade (RHS, Homes and Gardens).
Flowering 6 In flower July to August; tolerates light frosts but flower heads are damaged by frost and very cold weather (Homes and Gardens).
Seed ripening and harvest 8 Seeds ripen August to September, harvestable after flowering (Homes and Gardens, RHS).

Harvest & Storage

Mature golden-red quinoa seed heads ready for harvest — “Quinoa growing on Isla del Sol, Lake Titicaca” by Bob Ramsak is licensed under CC BY-SA 4.0. Source: Wikimedia Commons
“Quinoa growing on Isla del Sol, Lake Titicaca” by Bob Ramsak is licensed under CC BY-SA 4.0. Source: Wikimedia Commons.

When to pick: Quinoa dries down in the field; harvest when leaves have fallen and seed heads feel dry and firm, usually early fall; average time from planting to harvest is approximately 120 days; pollen may become sterile or seed death may occur above 95°F (35°C) during flowering

Diseases

Tall rows of quinoa plants growing in a field — “Productive quinoa real plant” by Michael Hermann is licensed under CC BY-SA 4.0. Source: Wikimedia Commons
“Productive quinoa real plant” by Michael Hermann is licensed under CC BY-SA 4.0. Source: Wikimedia Commons.
Quinoa downy mildew

Peronospora variabilis

Pests

A deep red flowering quinoa plant — “QUINUA REAL variedad sin identificar (3) UYUNI-POTOSÍ” by PeñayLillo is licensed under CC BY-SA 4.0. Source: Wikimedia Commons
“QUINUA REAL variedad sin identificar (3) UYUNI-POTOSÍ” by PeñayLillo is licensed under CC BY-SA 4.0. Source: Wikimedia Commons.

Aphididae (various spp.)

Lygus bug

Lygus spp.

References

  1. country=INTL

  2. country=INTL

  3. country=INTL

  4. country=UK

  5. Directly fetched and verified. RHS explicitly does not recommend pesticide use against aphids; recommends tolerance, manual squashing, and encouraging/purchasing natural predators (ladybirds, hoverflies, lacewings, parasitoid wasps, earwigs) as biological control, especially under glass.

  6. country=USA

6 independent sources are cited for this crop. Where they disagree - soil pH is the clearest case - every figure is preserved rather than averaged into false precision.

Frequently Asked Questions

What soil pH do quinoas need?

A pH of about 5.5–8. That span reflects genuine variation between the authorities we cite rather than a single agreed figure — the References section lists each source's exact range.

What problems affect quinoas?

Our data links 1 disease and 2 pests to this crop. See the sections above for each one and how to manage it.

Plan next season before the problems start

This page gives you the thresholds; the planner turns them into your own calendar. It works from what you can observe and measure in your garden rather than from dates written for somebody else’s latitude.

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SoilCommander Editorial Team

Science-based growing guides · Thresholds that hold in any climate

This guide states the conditions the plant itself responds to — soil temperature, frost tolerance, day length — rather than dates, because the same calendar month means opposite seasons in the northern and southern hemispheres. Anything genuinely restricted to one part of the world is named as such rather than presented as universal. Written and maintained by our editorial team against international horticultural research and extension sources.

Vegetable Growing Guides

Last verified 2026-08-29

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