I worked on all three of the Lord of the Rings movies way back in 1999/2000 and spent a glorious late spring month in Matamata [just south of Auckland] on the outdoor set of Hobbiton dressing the exterior Hobbit houses and making the place looked lived in. The Greens dept and Construction dept had already spent 12 months creating the hobbit holes and the hedge rows, vegetable and flower gardens. While I was there they erected the Oak tree that is above Bilbo's house. It was created from dissecting [and numbering each piece] a real oak tree, travelling it to the site and assembling it together, stunning to watch. A bunch of local uni students spent 3 weeks 'leafing' the branches with fake oak leaves before they were erected.