A Which Gardening report has proved that real seed potatoes rather than eating potatoes or potatoes sold from a previous crop are far more effective for production.
Almost a fifth of gardeners grew tubers saved from a previous crop, and 15 per cent planted potatoes sold for eating.
Researchers found non seed potatoes sprout poorly because they had been treated with a sprout inhibitor chemical.
Real seed potatoes were ready to plant a month earlier. There is also less choice among eating potatoes with few varieties available from supermarkets compared to garden centres.
Yields for seed potatoes are also typically 65 per cent higher.
Ten out of 15 rows of supermarket potatoes tested were infected with a virus, while only two of 10 rows of seed potatoes had diseased plants.