Arboretum
With fewer than four players, what happens to the cards of the unused tree species?
The rulebook's setup section says the unused colors are returned to the box.
- Arboretum rulebook · Rulebook · Preparing the deck
- gillum · Community · 2016-07-29
They go back to the box and are not used in play. With three players two colors are returned; with two players four colors are returned. Those cards are not discards, whether they would have lain face up or face down.