There are a number of parks and gardens to visit in the local area, recognising the love that French people have for the natural environment. Most are open from April to September but please check the websites for precise opening times.

Parc Botanique de Haute Bretagne: 25 hectare park with different themes and species La Bourbansais: château gardens, tours, activities for the family, zoo
 

Les Jardins des Renaudies: located in the Pays de la Loire, contemporary gardens in French and English style, old farmhouse to discover the past history

Many of the towns also have attractive and well maintained public gardens, ideal to wander around and enjoy the flora and fauna.  One suggestions is Fougères, which has superb hill-top views towards the castle.