However, the phonetic component is not always as meaningless as this example would suggest. Rebuses were sometimes chosen that were compatible semantically as well as phonetically. It was also often the case that the determinative merely constrained the meaning of a word which already had several. 菜 cài "vegetable" is a case in point. The determinative 艹 for plants was combined with 采 cǎi "harvest". However, 采 cǎi does not merely provide the pronunciation. In classical texts it was also used to mean "vegetable". That is, 采 underwent semantic extension from "harvest" to "vegetable", and the addition of 艹 merely specified that the latter meaning was to be understood.