A somewhat formal or written term for vegetables in general; in everyday speech, 野菜 (やさい) is more common.
I bought fresh vegetables at the market.
This dish uses seasonal vegetables.
Kana spelling is common in everyday writing, especially when the kanji are considered difficult or formal.
The kanji 蔬 means 'greens' or 'vegetables' and 菜 means 'vegetable' or 'greens'; the compound is a straightforward combination meaning vegetables. The exact historical derivation is uncertain.