Parsley is a biennial plant.
二年草は一年目に葉を茂らせ、二年目に花を咲かせます。
Biennials grow leaves in the first year and bloom in the second year.
多年草 is a perennial plant that lives for more than two years, unlike 二年草 which dies after its second year.
Compound of 二 (two), 年 (year), and 草 (plant). The term is a straightforward botanical classification.