Similar to apple storage. Clipping the tops off parsnips, carrots, beets, and turnips will nip their tendency to use moisture in leafy growth. Store carrots, turnips, or parsnips in boxes of sand. To keep carrots in the refrigerator, wash them right after harvest, remove the tops, and seal in plastic bags. Granulated sugar must be kept dry and cool, or it will harden.
Brown sugar contains moisture and hardens when exposed to air.
Store brown sugar in an airtight container or freezer for extended storage. If it does solidify, it can be softened by exposing it to moisture. Or store it with a slice of apple or citrus rind, tightly enclosed, until it's soft again. Doing so will ruin their flavor and texture at once. Don't keep them on a sunny windowsill either.