From the announcement:
Nowhere is nature's beauty quite so evident as in the resplendent colors of an arboretum. In Arboretum, you create carefully planned paths for your visitors to walk as they take in the colorful explosion of buds and leaves. The cheerful cherry blossom, the fragrant dogwood, the mighty oak – all have a place in this peaceful haven. But the tranquil setting belies the game's competitive heart. You must choose which cards to plant in your arboretum and which to keep in hand, as only the most expert curator will win the renown of nature enthusiasts everywhere.