Collard greens are packed with nutrients such as vitamin C and are also high in fiber. The vegetable is typically cooked or steamed for use in warm dishes, but also freezes well and retains much nutrition and flavor if prepared properly beforehand. Frozen collard greens are especially versatile because it's not necessary to thaw them before tossing them in boiling water or combining them with the ingredients of your favorite recipe.
Fill a large pot with 5 quarts of water. Bring the water to a full boil over medium high heat.
Set a large bowl near the cooking surface. Fill the bowl halfway with ice and add cold water until the bowl is full.
Rinse the collard greens under running water. Trim the stems off the tender leaves. Discard the stems.
Submerge the prepared greens in the boiling water. Bring the water back to a full boil after adding the greens.
Boil the greens for 3 to 4 minutes. Remove the greens from the pot with a slotted spoon.
Immerse the collard greens in the ice water for 3 to 4 minutes. The water cools the greens and prevents them from cooking further, which negatively affects their texture and nutrient content.
Pour the collard greens into a colander and drain completely. Package them in a freezer storage bag or container. If you use a freezer bag, remove as much air as possible from the bag by pressing down on it while sealing. Freeze the collard greens immediately.