This article makes it sound like a grinder is not necessary:
Mix into baked goods. You can use freeze-dried fruit inside of baked goods where you’d otherwise think about traditionally dried or even fresh fruit. Again, the bonus: No added moisture to mess with your batter. Plus, they’ll plump a little and be pleasantly chewy after baking. So go ahead and stir them into your favorite muffin, scone, oatmeal cookie or quick bread recipe.
Invasive plants are Earth's way of insisting we notice her medicines. Stephen Herrod Buhner
Everyone learns what works by learning what doesn't work. Stephen Herrod Buhner