Barrie Juniper, a former member of the Department of Biology established a collection of 100 different sorts of apple in the Wytham Walled Garden when he and Stephen Harris were working on the genetics of apples. Many of these still survive, although some have died out.
The Walled Garden is not normally accessible, but on a couple of afternoons in the autumn it is open for anyone to come and pick the fruit (though taste them first, some are rather bitter).