Formerly unloved vegetable casts off lowly roots to feature in Great Pavilion after online craze among young gardeners Formerly unloved vegetable casts off lowly roots to feature in Great Pavilion after online craze among young gardeners They are an unloved root vegetable traditionally grown for cattle feed, and when pulled from the ground they look like an ingredient destined for a witch’s cauldron. But the humble mangelwurzel will be in pride of place in the Great Pavilion at this year’s