Garlic is a pungently odoriferous member of the allium family (like onions and leeks). Garlic is generally used as a spice or a seasoning rather than as a vegetable due to its extremely strong flavour. Garlic grows in large papery heads. A novice mistake is to massively overgarlic things by following instructions incorrectly. Remember that the large bulb of garlic you buy is NOT one 'clove'. The whole garlic is called a 'head' or 'knob'.
Bumblebees do not damage brickwork or wood. Some of the bumblebees which make smaller nests, Bombus pratorum and B. hortorum do sometimes chose strange places to nest. Their nests are small and in the case of B. pratorum are usually very short lived.
In one B. lapidarius nest that he reared in a nest box he took over four ounces of honey and the nest still survived. So yes, in theory we can get honey from bumblebees as it is made by the same method as hive bee honey, but the quantity is so small that it would never be commercially viable to do so. Also, I believes, that it is thinner and more watery than honey bee honey, so ferments more easily.