Yellowed or wilted tops indicate age and should be rejected.  Roots that are very large and coarse or are in any degree wilted should also be refused.  

If bought with tops on for consumption, the tops should be removed and used as soon as possible.  Greens that are warm when sold are likely to be tough and, in general, should be avoided.  After purchase, keep greens as nearly ice-cold as possible, and moist.  Turnips should be  kept in a cold and humid place until ready to use.