Giant Worms are an excellent source of vitamins and minerals which makes them a perfect part of the reptile diet, as well as being an important food source for many species of birds. As long as they're kept refrigerated, they will last for a number of weeks. Giant Worm Care: Giant Worms are relatively easy to keep! Keep Giant Worms in the refrigerator (45°) and removed once a week to put a slice of fruit or vegetable in the cup. Leave out for 8 hours at this time, then remove the fruit or vegetable slice and return to the refrigerator. Your Giant Worms should last for weeks. When you are ready to use them, remove the desired amount and leave at room temperature until they become active, roughly 24 hours before feeding to your animal. If you plan to keep the Giant Worms for longer than two weeks, remove them from the refrigerator, and let them become active. Once they become active, place a slice of potato on the top of the bedding to provide moisture, and let them sit for 24 hours. Then, place them back in the refrigerator.