Harvest in July when the tops have yellowed or died. Do not leave in ground exposed to high soil temperatures from sun. Wash potatoes and remove the diseased or damaged ones. Avoid exposing tubers to light. Store in as cool a place as possible at this time of year.
Cool basements are probably the best storage available.
Keep humidity high and provide good ventilation. Storage time is 2 to 4 months. Wash roots, trim both taproot and tops and store in plastic bags in a refrigerator for up to a month. Winter or black radishes are stored the same as carrots. See parsnips for harvest and storage.