(of plants and shrubs) shedding foliage at the end of the growing season
source: WordNet 3.0
Falling off, or subject to fall or be shed, at a certain season, or a certain stage or interval of growth, as leaves (except of evergreens) in autumn, or as parts of animals, such as hair, teeth, antlers, etc.; also, shedding leaves or parts at certain seasons, stages, or intervals; as, deciduous trees; the deciduous membrane.
source: Webster 1913
(of teeth, antlers, etc.) being shed at the end of a period of growth