How to Grow Welsh Onions

How to Grow Welsh Onions [Beginners Guide]

Welsh Onions are unique in the world of gardening because they produce bulbs or bulbing trefoil leaves rather than a bulbous stem that produces clusters of flowers. The onions can be used as a garnish or as an ingredient in stir-fries, sautés, and salads.

If you love eating or preparing meals using welsh onion, why not try growing yours today by following these simple steps which include considering soil properties, selecting an ideal planting site, choosing a variety of seeds, seed planting, plant maintenance, watering, fertilizing, weeding, and harvest.

Welsh onions develop into a bulbous shape with a firm, deep green flesh that can be eaten raw or cooked. It is an easy-to-grow plant that is ideal for outdoor cultivation. It’s so easy to grow, you can start them yourself and be enjoying these tasty bulbs in a few weeks.

How To Grow Welsh Onions

If you are interested to grow on how to grow welsh onions on your own, here are important steps that you need to consider before you take off on your planting venture.

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Step 1: Soil Properties

Welsh onion is a perennial onion that thrives in warm, moist conditions, as such, Welsh onions thrive in direct sunlight. Hardy in most climates, though grown as an annual in cooler areas with winter frosts.

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Welsh onions grow best in a deep, rich loam and sandy soil with good drainage, but with a pH above 7.5, ideally 6.5 to 7.5. The soils should be well drained and neither excessively wet nor too dry. Welsh onions do not like moist, wet, or soggy soil.

Step 2: Select the Ideal Planting Site

Welsh onions can be planted in a garden at home, indoors, or on large farmland for commercialization. Whichever it is, make sure the location you choose has the ideal soil and climate properties mentioned earlier.

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More so, the site should have access to rainfall or water supply. Make sure the location is motorable and can be easily accessed. Also, it should be away from pollution, especially air and dirt.

You can start with a plot of land or half depending on your resources.

Step 3: Choosing a variety of seeds

Welsh onions have different varieties. There are larger varieties that resemble leeks such as the Japanese Negi, and smaller varieties that resemble chives.

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Make sure you choose quality varieties that will enhance yield and marketable products for commercialization. Importantly, you can get Welsh onion varieties from an existing farmer, breeder, or any other reliable source.

Step 4: Planting Site Preparation

Planting sites should be prepared as soon as possible after frost-free weather begins. The planting site must be free of weeds, rocks, and other debris. You may want to level the ground or add some organic soil amendment to loosen the soil a bit.

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This can help with drainage, which is important when planting welsh onions. Your farm should also feature adequate water runoff and aeration.

There is a need to create a raised bed or a mound for planting. This will help to provide higher yields as well as better root development.

Step 5: Seed Planting

Welsh onions are grown from seed in late winter or early spring and planted out in the spring following the last frost. They are grown in small groups, called “clumps”.

You should plant the direct seed ¼ inch apart in clusters 2 to 3 inches (5-7.6cm) apart. If you want to harvest plants with a large diameter, space seedlings no more than an inch apart.

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You can plant the seed indoors using planting trays and or containers as well and then transplant the sprouted plant to the main farmland.

Step 6: Plant Maintenance

There are maintenance activities that you need to carry out. These include:


Make sure you water the seeds to help germination and water regularly throughout their early growth until they reach 18 inches tall. The leaves and seeds may spoil rapidly if they are too wet – don’t let it happen!

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Fertilizer is not necessary, particularly if you add compost to the soil at planting time. However, if your soil is poor or growth appears stunted, apply a light application of a balanced organic fertilizer every three to four weeks.


Mulch will aid in weed prevention and water management; however, once the bulbs have grown, they should be removed.

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Remove any seen unwanted plants that grow alongside your Welsh onion plants. It is easy to identify weeds because of the distinct leaves of welsh onions. Weds can be removed by hand or spray herbicides that are not injurious to the plant.

Step 7: Harvest

Welsh onions should be harvested when they are at least 6 inches (15 cm) tall and at least as thick as a pencil. Plants should be pulled out with a trowel. Try not to pull on the plants because the stems are fragile.

How Long Does It Take Welsh Onions To Grow?

It takes about 65 days for onions to grow to maturity and then harvest takes place.

Is Welsh Onion Perennial?

Welsh onions are perennial crops because they will regrow as long as you don’t pull them out completely. It can regrow for several years.

How Do You Grow Welsh Onion Seeds?

Growing Welsh Onion from Seeds is a simple process, which has been made easier by the availability of many good varieties over the last few years.

The seeds should be planted in late summer or early autumn into well-prepared, well-drained soil. You will need to sow the seed thinly and thin to about 1.5cm deep, in rows 23cm apart.

Are Bunching Onions The Same As Welsh Onions?

Yes, Bunching onions is another name for Welsh onions.

How Do You Look After Welsh Onions?

To look after your Welsh onions, you have to water them regularly, especially during hot, dry weather. Make sure there is no shade as the plant requires full sunshine. More so, there is no need to apply fertilizer, except if the yield is poor or the soil PH is not high enough.

Do Onions Come Back Every Year?

Onions are annual plants, as such, they don’t come back every year but have to be replanted.

Should I Let Welsh Onions To Flower?

Yes, you can let your welsh onions flower as you can make use of the flower as well.

Can You Eat Welsh Onion?

You can eat welsh onions either cooked or raw.

What Happens If You Leave Onions In The Ground Too Long?

Leaving onions in the ground for too long will result in a larger bulb. Also, it can multiply forming a new section that resembles garlic which can be replanted.

However, you shouldn’t leave them in the ground longer than 2 or 3 weeks max because they will susceptible to pests and diseases that will allow the onion to rot.

Do Bunching Onions Multiply?

Bunching onions multiply meaning you will get new onions offspring that you can grow annually.

How Do You Grow Bunching Onions In Pots?

Get your planting pot and fill it with soil or potting mix. Moist the soil and plant the seed, water again and place under sunlight. Continue to water to avoid the plant starves of water.

Which Onion Is the Sweetest?

White Onion is the sweetest of all the different onion varieties.

How Many Onions Do You Get from One Onion Bulb?

You can’t no more than one onion per onion bulb.

Will Onions Survive Winter?

Onion is capable of surviving cold temperatures and still produces quality bulbs even after they bolt in spring.

Why Are My Onion Stalks Falling Over?

When your onion stalks fall over, it is a sign that they are mature and ready to be harvested.

What Happens If You Don’t Pick Onions?

If you don’t pick onions when you ought to, there is a chance that they will rot especially if the soil is wet. However, during winter, it can grow bigger and split into section.

How Do I Get My Onions To Grow Bigger?

If you want your onions to grow bigger, you should select the right variety, plant at the right time, water adequately, and add fertilizer to improve soil nutrients to aid growth.

How Do I Know When To Dig Up My Onions?

You can dig up your onions if it reaches the desired marketable size. Generally, you can dig up your onions when you see the leaves beginning to fall or turning brown at the edges.

How To Eat Welsh Onions

Welsh onions can be eaten raw or cooked. It can be added to salads, stir-fries, and sautéed. It can also be used as a garnish.

Can You Eat Welsh Onions

Welsh onions are preferred for their flavor. For that reason, it is eaten either raw or cooked, whichever way you prefer.

How To Cook Welsh Onions

There are different methods of preparing welsh onions depending on the type or variety of food you want to prepare.

How To Store Welsh Onions

Welsh onions can be stored in the refrigerator or on the ground in the garden. However, it is preferable to leave it on the garden ground as the taste remain will remain fresh compared to storing it in the refrigerator.

Buy Welsh Onions

You can buy welsh onions from reputable sources either online, in physical farm stores, ministry of agriculture, and other viable places.

Welsh Onion When To Pick

Welsh onion is best picked between June to October.

How To Harvest Welsh Onion

To harvest welsh onion, dig up the whole plant carefully so that the stem does not break.

Growing Welsh Onions In Pots

Get a planting pot and fill it with a well-prepared potting mix. Water mildly and plant the welsh onion seed 1-inch deep and cover with a pinch of soil. Place the container in a sunny location and water continuously.


Welsh onions are gorgeous and easy to grow. All you need do is to follow our step-by-step guide for growing Welsh onion seeds as discussed here from beginning to end to get the optimal result.

Author: David

David is a Kenyan farmer from the rural village of Nairobi. Growing up, he was surrounded by the beauty of the Kenyan countryside, which sparked his passion for farming. After completing his education, he decided to pursue a career in agriculture and has since dedicated his life to providing food for his local community. David is an experienced farmer and is experienced in a range of agricultural practices, including crop rotation, animal husbandry and soil management. He is passionate about promoting sustainable agriculture and is actively working to reduce food insecurity in his community.

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