蔬 is a bound morpheme (b.f.) meaning 'vegetable' — it almost never stands alone in modern Chinese. You'll find it as the first character in compounds like 蔬菜 ('vegetables', the common word) and 果蔬 ('fruits and vegetables'), or as the second element in 时蔬 ('seasonal vegetables'). It's a formal/literary root; in everyday speech you'd say 菜 for 'vegetable' or 蔬菜 for 'vegetables'.