Key takeaways
- Choose a variety bred for northern Europe, such as 'Titicaca', or it may never ripen
- Sow direct 1cm deep from late April to mid-May, once the soil has warmed
- Seedlings look almost identical to fat hen, so sow in straight, marked rows
- Harvest in September when the seed resists a thumbnail, before autumn rain
- Dry the heads for one to two weeks, then rub the seed out and winnow it
- Rinse the grain in several changes of cold water until it stops foaming
Quinoa will grow in a UK garden or allotment, as long as you pick the right variety. It’s a tall, colourful plant that’s easy to grow. The real work comes at the end: drying, threshing and rinsing the grain so it’s good to eat.
This guide takes you from sowing in spring to a jar of clean grain in autumn. It’s a fun project for anyone who likes unusual crops.
Why quinoa grows well in the UK
Quinoa is a close cousin of fat hen, a weed that grows happily all over Britain. So it’s no surprise that quinoa copes with our soils and weather once it gets going. It needs little feeding and, once established, little watering.
It looks great too. In September the seed heads turn cream, gold, orange or crimson, depending on the variety. It fits well in a low-water plot alongside other drought-tolerant vegetables.
Which quinoa varieties grow best in the UK?
Choose a variety bred for northern Europe. ‘Titicaca’, bred in Denmark, is the best known and usually ripens here by September. UK seed companies also sell mixed-colour types such as ‘Rainbow’ for home growers.
A northern-bred variety colours up and ripens by September, while unsuitable types stay stubbornly green.
Variety matters more than anything else. Many traditional quinoas come from South America and only flower and set seed as days get shorter. In the UK that happens too late, so the plants grow big and green, then meet the frost with unripe seed.
Don’t sow supermarket quinoa. It’s usually not a type suited to the UK, and much of it won’t germinate. Buy proper seed once, then save your own.
When and how to sow quinoa
Sow direct from late April to mid-May, once the soil has warmed. Quinoa doesn’t like its roots disturbed, so it’s better sown where it will grow. A handy sign: when fat hen seedlings start popping up on bare soil, it’s warm enough.
- Rake the bed to a fine, crumbly surface.
- Draw drills 1cm deep and 35-40cm apart.
- Mix the tiny seed with dry sand and sow thinly.
- Water once and mark both ends of each row with canes.
- Thin seedlings in two goes, first to 10cm, then to 25-30cm apart.
The thinnings are edible and cook like spinach. Quinoa is related to beetroot, chard and spinach, so grow it in the same part of your rotation. Our crop rotation planner helps you plan where it goes.
How to tell quinoa seedlings from fat hen
At first, quinoa and fat hen look almost identical. Both have grey-green, slightly powdery young leaves, and they come up at the same time. Lots of first-timers weed out their own crop by mistake.
The only reliable test is position. Sow in straight rows, mark both ends, keep only the plants in the line and pull everything between rows. Some quinoa varieties show a pink or red tinge at the stem base, which helps a little.
Two habits make this easier:
- Stale seedbed: prepare the bed two weeks early, let the first flush of weeds come up, hoe them off, then sow.
- Hand weeding: weed along the rows by hand, not with a hoe, until plants are about 15cm tall. After that quinoa outgrows fat hen.
Quinoa and fat hen seedlings are almost twins. Straight, marked rows are the only test you can trust.
Quinoa from flowering to harvest
Growth is slow until June, then speeds up fast. Plants grow well over 1m tall and flower in July, with dense plumes at every tip. Through August the heads fill with seed and start to nod.
In September the heads colour up. Colour alone doesn’t mean ripe, though, so check two things:
- Thumbnail test: press a seed with your thumbnail. Ripe seed resists. If it squashes, wait.
- Leaf drop: ripe plants lose most of their lower leaves.
On exposed plots, stake any plants that start to lean under the weight of their heads.
In July every growing tip carries a plume, and each one becomes a seed head by September.
How to cut and dry quinoa seed heads
Cut each head with about 20-30cm of stem on a dry day, once the dew has gone. Handle them gently, as ripe seed falls out easily.
Tie the stems in small bunches and hang them upside down for one to two weeks somewhere dry and airy, like a shed or garage. Put an old sheet underneath to catch seed that drops. They’re ready when the heads feel papery and seed falls with a light shake.
Don’t rush this. Seed threshed while still damp clumps together, winnows badly and can go musty. The same hang-and-dry method works for pulses, as our guide to drying beans and peas explains.
A sheet underneath catches the seed that drops as the heads dry, and it’s often the best of the lot.
Threshing and winnowing without special kit
Threshing means rubbing the seed free. Wear dry gloves, hold each head over a clean bucket and rub it between your palms. Seed falls out along with plenty of chaff and dust. The dust can irritate, so work outside or wear a simple dust mask.
Winnowing blows the light chaff away from the heavier seed:
- Set a fan on low, or wait for a steady light breeze.
- Pour the threshed mix slowly from one bucket into another in front of the airflow.
- The seed drops into the lower bucket and the chaff blows away.
- Repeat a few times until the seed runs clean.
A desk fan on low is all you need. The heavy seed drops straight down while the chaff blows aside.
How to rinse quinoa to remove saponins
Every quinoa seed has a coating of saponins, bitter, soapy compounds that put off birds and insects. Shop quinoa is already cleaned. Yours isn’t, and unrinsed quinoa tastes soapy and bitter.
Cloudy, foamy water means saponins are still coming off. Keep rinsing until it runs clear.
- Put the grain in a deep bowl and cover it well with cold water.
- Swirl hard with your hand. The water turns cloudy and foamy as the saponins come off.
- Let the seed settle, then pour the water off through a fine sieve.
- Repeat. It usually takes several changes before the water stops foaming.
- Jar test: shake a teaspoon of grain in a jar of water. No foam means it’s done.
- Cook straight away, or spread it thinly on a tray to dry in an airy room before storing in jars.
Keep some unrinsed seed for next year. The saponin coating helps protect it in storage. Our guide to seed saving for beginners covers choosing and storing seed.
Quinoa month by month
| Month | Task |
|---|---|
| January | Order seed of a northern-bred variety |
| February | Choose a sunny, free-draining bed |
| March | Prepare a stale seedbed. Warm the soil with fleece if it’s cold |
| April | Sow direct from late April once the soil has warmed |
| May | Finish sowing by mid-May. Hand weed and thin seedlings |
| June | Weed until plants pass 15cm. Water young plants in dry spells |
| July | Flowering. Little watering needed once established |
| August | Heads swell. Stake leaning plants on exposed sites |
| September | Harvest when seed resists a thumbnail |
| October | Cut any remaining heads before long spells of rain. Hang to dry |
| November | Thresh, winnow and rinse. Store dry grain in jars |
| December | Set aside saved seed for spring |
Common mistakes when growing quinoa
- Growing the wrong variety. Types not bred for northern Europe often don’t ripen before autumn.
- Sowing supermarket quinoa. It usually won’t grow or ripen. Buy proper seed.
- Hoeing off your seedlings. Sow in marked rows and hand weed until plants pass 15cm.
- Harvesting too late. Ripe seed left out in a wet autumn can sprout in the head.
- Skipping the rinse. Unrinsed quinoa is bitter and soapy, so rinse until there’s no foam.
If you enjoyed growing your own grain, try our guide to growing grain for flour, or browse the growing hub for more home-grown staples.
Frequently asked questions
Can you grow quinoa in the UK?
Yes, if you grow a variety bred for northern Europe. ‘Titicaca’ is the best known and usually ripens here by September. Sow direct in late April or May. Many traditional South American types don’t ripen before the UK autumn.
When do you sow quinoa in the UK?
Sow direct from late April to mid-May, once the soil has warmed. Sow 1cm deep in rows 35-40cm apart and thin to 25-30cm. Seed sown into cold, wet soil often rots, so don’t rush.
How do you remove saponins from quinoa?
Rinse the grain in several changes of cold water until it stops foaming. Swirl it hard, let it settle, then pour off the cloudy water. Shake a spoonful in a jar of water as a test. Any foam means it needs another rinse.
How much quinoa do you get from one plant?
Expect a modest harvest, enough for a few meals from a short row. Yield depends a lot on the variety, spacing and summer weather. Grow it for interest and fun rather than to replace shop-bought grain.
When is quinoa ready to harvest in the UK?
Usually in September, when seeds resist a thumbnail and most leaves have dropped. Cut the heads before long spells of autumn rain, as ripe seed can sprout in the head. Hang them upside down somewhere dry for one to two weeks.
Is quinoa the same plant as fat hen?
No, but they are close relatives. Quinoa is Chenopodium quinoa and fat hen is Chenopodium album, a common weed. The seedlings look almost identical, so sow quinoa in straight rows and weed between them by hand.
Our team produces practical UK gardening guidance from source research, contributor records and established horticultural practice. Editorial standards are overseen by Matt W.
