All the principal deciduous trees ( beech , oak , ash , sycamore ) grow well .
All the principal deciduous trees ( beech , oak , ash , sycamore ) are allowed to mature over long periods , up to 110 years for beech .
All the principal deciduous trees ( beech , oak , ash , sycamore ) grow well and are allowed to mature over long periods , up to 110 years for beech .