Fresh parsley adds a bright clean flavor to food that its dried counterpart cannot match. Most supermarkets stock bunches of tender sprigs in their refrigerated produce cases, where the parsley receives a regular misting to keep it bright green and vibrant. Once you get the fresh parsley home, optimize the parsley's storage time by replicating the conditions it enjoyed at the grocery store.
At home, place the parsley in a small jar or glass filled with water about halfway up the stems. Cover the parsley with a hood made of plastic wrap or a plastic bag; secure it around the rim of the glass or jar with a rubber band or kitchen twine. Place the jar in the refrigerator away from meat and produce, and change the water when it appears cloudy. The parsley should keep for up to 10 days.
Alternatively, wash the fresh parsley as soon as you get it home, drain it on paper towels, and place it and a fresh paper towel inside a resealable plastic bag or other plastic container. For long-term storage, or if you have a surplus, chop parsley that has been washed and dried thoroughly, place it in plastic bags or containers, and freeze it at 0 degrees Fahrenheit for up to 6 months.