I dehydrate frozen vegetables which are already blanched before freezing. With fresh veggies, you do need to blanch.

In addition to green beans, peas and corn also remain rock-like after hydrating. I therefore buy most veggies freeze-dried in bulk and add them to my meals. Chopped spinach, though, dehydrates and then rehydrates really well, and will give a nutritional and flavorful boost to most meals.

Lots of info on dehydrating on "Sarbar's" website. (Note--site appears to be down at the time of posting this.)