育児園[ikujien] baby nursery
園芸[engei] horticulture
園児[enji] kindergarten pupil
園長[enchou] head of a garden
園遊会[enyuukai] garden party

果樹園[kajuen] orchard
開園[kaien] opening, either for the day or a "grand opening" (e.g. theme park, botanical garden etc.)
学園[gakuen] academy
学園祭[gakuensai] school festival

御苑[gyoen] imperial garden
田苑[denon] country
入苑[nyuuen] enrollment in kindergarten
入苑券[nyuuenken] ticket to the garden
内苑[naien] inner garden

外苑[gaien] outer garden
神苑[shinen] shrine gardens
芸苑[geien] artistic and literary circles
神宮外苑[jinguugaien] outer gardens of Meiji Shrine