Reptiles in general tend to do best with 1-2% calcium content at a 2:1 calcium to phosphorus ratio. According to this chart,
https://www.caudata.org/cc/articles/foods2.shtml
you would probably be running the risk of overdosing your garter on calcium if you dust its food regularly. Like chairman mentioned, you should be fine by simply gut loading the worm prior to feeding. Collard greens, mustard greens, and dandelion greens are all great choices for this, but it's best to offer a variety of vegetables to your worms to make sure they're not only high in calcium, but also the proper nutrients. I've never fed earthworms off before, but for most of my insects I would feed them a salad of collard greens, orange, carrots, and sweet potato. You can always search around for what works best for you, but just stay away from lettuce as it has little to no nutritional value besides water.
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