Here’s a subject where I do remember citations. In
The Hobbit, if you recall,
Thorin told
Bilbo that the
Dwarves of the
Lonely Mountain traded their handiwork for foodstuffs, which they never bothered to grow for themselves. And in
Unfinished Tales, in “The Quest for
Erebor”,
Gandalf was trying to convince the Dwarves to take Bilbo along with them, and in that argument he describes the
Hobbits with what appears to be a Dwarvish term (of derision?), “food-growers.”
How they survived during the
First Age, before they met and could trade with the
Elves, is another matter: they must have hunted or engaged in agriculture. Thorin & Co. loosed
arrows against the deer they found in
Mirkwood, but whether their failure to obtain a deer was incompetence or just bad luck, I cannot say.
There seems to have been considerable traffic in the First Age between the Dwarves of Nogrod and Belegost and the
Noldor, so that Caranthir became quite wealthy, according to
Silmarillion, “Return of the Noldor”. The Dwarves helped
Thingol construct
Menegroth, so there was considerable commerce even before the Noldor returned to
Beleriand.
There isn’t much discussion about Elves growing
food either, except in one instance in
HoME in which
Tolkien describes Elves growing food (wheat?) for the preparation of
lembas.