摘心xīn除chú老叶yè :以yǐ采cǎi收shōu茎叶yè为wèi目mù的紫苏最新紫苏de时shí,通tōng常上shàng端duān1/3部位的收购市场收购de花huā先开kāi,共间jiān苗miáo2至zhì3次cì