Oxford University’s arboretum occupies part of a famous park, Nuneham Courtney, designed by Lancelot Brown (not open to the public). Highlights are the bluebell wood in spring, wildflower meadow in summer and the Japanese acers in autumn. The Harcourt Arboretum, with its acid soil, open spaces and informal serpentine walks provides an interesting contrast to the University of Oxford Botanic Garden.