that's a great idea; I'll see what I can rummage up; would be much better from all points of view than an upturned bucket!
hard to say. That border was planted up over 20 years ago, long before I had chickens. Some shrubs do self-seed (notably, pittisporum) and there are some in the leak gap, so they can survive even mere inches tall. I guess it depends on whether the shrub and/or what lives with/on it attract their attention or not. And the existence and attractiveness of alternatives for their attention. My flock definitely work their territory on rotation, as if they were born knowing about mob grazing. They work an area and then move on and give it a rest. Very few things have been wiped out by them.
might be that family but not the culinary herb. It's variegated, leaves much thinner and finer than bay. I must have it noted somewhere; I'll try to dig it out. It's a fine addition to the border. And suits the conditions here very well.