All root crops like a deep, well-dug, moisture-retentive soil that has had some compost added; manures and other strong soil improvers are best added for a previous crop as they can cause the roots to fork. On heavy soils, stick to stump- or round-rooted varieties as the roots down go down so far. Try to remove as many stones as possible as this can also lead to forking.

Beetroot
Carrots
Celeriac
Chicory, endive and radicchio
Onions and shallots
Parsnips
Potatoes