1) Abounding in stalks 2) Describing some grasses 
hay or forage with thick stems and few leaves.
• (a.) Abounding in stems, or mixed with stems; -- said of tea, dried currants, etc.
Taste sensation of mixed "green and bitter" caused by the wine having been fermented in the presence of too many stems (called stalks in Britain). See stems.
Stem'my adjective Abounding in stems, or mixed with stems; -- said of tea, dried currants, etc. [ Colloq.] 
A term used to describe harsh, green characteristics in a wine.
Wines fermented too long with the grape stems sometimes pick up an unpleasant astringent aroma and flavor.