Basket of homegrown veg

Growing prize-winning veg

Find out how to grow prize-winning veg that will impress the judges at your local produce show.

Sometimes in the veg garden, something goes spectacularly right – a truss of unblemished tomatoes, or a huge marrow. Entering your best produce to a show is a good way of finding out how good it really is.


Discover the best vegetable plants for beginners.

Grow more veg than you need to allow a few plants to fail and to give you a good selection to choose from – you’ll need several of the same shape and size. 

We talked to prize-winning grower Medwyn Williams, who has 11 Chelsea gold medals and an MBE for his flawless exhibits, for his tips on growing crops that will impress the judges.

Entering your best produce to a show is a good way of finding out how good it really is.


What judges want: Good weight and girth, freshly cut, no cracks or pest damage

Top variety: ‘Atlantic Giant’

How to grow: Medwyn’s son grows two or three pumpkin plants in a 30m polytunnel and bury each leaf joint, encouraging a huge root system. Failing that, give plants warmth, very rich soil, and lots of extra feeding.



What judges want: Straight roots with a well-rounded stump end, no cracks or greening

Top variety: ‘New Red Intermediate’

How to grow: Medwyn grows carrots in 45-gallon drums filled with sand. Alternatively, make beds of damp sand 60cm deep, then twist out 40cm deep cores. 7.5cm in diameter. Fill each hole with compost and sow three seeds on top, thinning to the strongest. Cover with insect-proof mesh to keep out carrot fly.



What judges want: Uniform size, firm texture, even colouring, blemish-free with a bright green calyx

Top varieties: ‘Shirley’, ‘Myriade’ and ‘Goldstar’

How to grow: Grow in a cool, well-ventilated greenhouse. Medwyn waters just-planted seedlings with a pint of water, then leaves for 10 days, to make the roots go deep to search out water. He then gives them a good soak and keep them moist from then on.


Runner beans

What judges want: Deep green colour, uniform length and no strings – the judges will snap one to check

Top variety: ‘Stenner’

How to do it: Runner beans need rich soil and strong supports. A few days before, looks for straight, flat beans, 35-40cm long. Stand them in water, stalk down, then the next day go back for more, so that by show morning you have a set of identical beans.



What judges want: A uniform shape and size, with a firm texture and well-ripened, unblemished, dry skin

Top variety: ‘Kelsae’

How to do it: Start early. Medwyn sows onion seeds into heated propagators, then moves them outside in mid-May, planting throught black and white polythene, laid white side up to reflect heat onto the bulbs. Lift the bulbs three weeks before show day to dry.



What judges want: Uniformity of size, colour and shape, with no yellowing or soil splash marks

Top variety: ‘Table Dainty’

How to do it: Even colouring can be tricky, as marrows on the ground usually turn yellow beneath. Medwyn trains his up a framework. Alternatively, put each fruit on glass raised up on two bricks, so light can reach the underside. Give marrows rich soil and lots of feeding and warmth.



What judges want: Straight, with an equal ratio of leaves to shank. A perfect V where the leaves wrap round the barrel.

Top variety: ‘Windermere’


How to do it: Exhibition growers raise leeks from ‘pips’ formed on their best plants from the previous year. In September, trim your best leek’s roots and cut the top down to 15cm. When it flowers in spring, snip off every bloom. It will produce grass-like baby leeks from the seedhead – gently remove and pot up for this year’s champions.


What judges want: Tubers of identical size and shape, with unmarked skin, shallow eyes and no signs of scab

Top variety: ‘Mona Lisa’


How to do it: Medwyn grows his show potatoes in bags. He plants one chitted tuber per 20-litre plastic bag, using compost boosted with general-purpose fertiliser and ground, calcified seaweed. He digs a shallow trench outside, stands the bags in it and earths up around them. The plant’s roots grow through the bags’ drainage holes into the soil. Lots of water and tomato feed later, he has a clean crop of perfect tubers.


What judges want: Evenly coloured pods, with an unblemished bloom, well filled with 6-15 peas.

Top variety: ‘Show Perfection’


How to do it: Grow each plant up a sturdy cane, remove sideshoots and tie in at every leaf joint, as mature plants are top heavy. To select perfect pods, shine a torch through them to show up any missing peas. Hold by the stalk only, as the pod’s delicate boom is easily damaged. Medwyn sandwiches his pods between nettle leaves to keep the bloom intact.


What judges want: Smooth skin with no scabs or splits, and a single, intact tap root

How to do it: Sow seeds in deep, well-turned soil and thin to 5cm apart. As they grow, earth them up to cover the globe so the skins don’t turn corky on top. On show day, keep the skins moist by covering with damp kitchen paper until the judges come round. Damp skin has that fresh, just-pulled look and it helps soften scuff marks.

Top variety: ‘Pablo’



What judges want: Straight, fresh fruits, a short ‘handle’ (the thinner, stalk end) and an untarnished, natural bloom.

Top variety: ‘Carmen’


How to do it: Medwyn says that humidity levels should be so high that you have to take off your glasses when you go into the greenhouse. Medwyn lays down thick wads of straw, which he soaks with water so they steam steadily on sunny days. To straighten crooked fruits, let them dry out – when almost wilting they become rubbery and are easy to shape by hand. Water again and they shoot away again, straight.

Don’t get disqualified

Check the rules before you enter to avoid the dreaded ‘NAS’ (Not According to Schedule) – at strict shows, even displaying veg on the wrong type of plate or using the wrong twine will get your entries disqualified.