#3 is yes, green garlic is very nice. That's how I mostly use it.

#2 is no, if you want large as possible bulbs.

#1 you can cut-and-come-again with onion greens, but more typical is to plant close and thin out for scallions during the season to end up with 6 to 8 inch spacing which get left for the full-size bulbs.

I agree with pnbrown, although I think that the answer for 2 applies to 3 as well. If you want large garlic bulbs, don't eat the green off the garlic. I plant the small cloves in a seperate area in the fall and pull them in the spring as I want for green garlic. But if you haven't tried it before, pull up a couple now and give it a taste.

And if you have hard neck garlic, you will get garlic skapes. That is where the stalk is curved with the start of a seed pod on the end. Pick them while they are still curved and your garlic will grow larger. They are quite tasty.

Thanks for your helpful replies, pnbrown, sunnibel7, and spogarden.