They graze just like a sheep. My neighbor had oodles of them and they would come and eat the grass in my front yard, in my pasture and I noticed no reduction in bugs--noise, a pain, they are good to eat if you get them young. Don't even ask about what they leave behind--not spit.
Try this, what do they look like when you buy them in the store? You can pull your beets when ever they have a bulb on them, your broccoli needs a head on it, your carrots need a sizable root an it depends on what kind of onions you planted.
i live in Idaho and never had that problem. It is way hot for them now. I would just pull and replant and see how they do. Remember to take scissors and thin them some.
add a little brown sugar, dried mustard, chili powder, salt, pepper, garlic and of course lots of green onion. Check it out and pass the chips and sour cream.