Agrocampus Ouest Angers offer a master´s degrees programme of Horticulture and Landscaping architecture. You must to specialise in one at the end of your studies, but you have a knowledge of both. It´s a small school (around 450 students) but a very good collective. Also, a lot of after school´s activities. I really recommend this school if you are interested in Horticulture of Landscaping.