A trichome is a hair-like structure that is part of the epidermal tissue. The trichomes indicated by the red arrow at left appear short and pointed. A possible function of these trichomes may be to deter insects.

Vitis species vary in the amount of trichomes on their leaf surfaces. However, many have long, matted trichomes on their abaxial leaf surfaces. These trichomes may act to prevent water loss from the leaf surfaces, or they may function as a layer of insulation against extremes in temperature.