levisticum officinale

not a native; originates in the iran/afghanistan area, but has been naturalised all over europe for centuries. it grows pretty tall -- mine is now in its 4th year, and it's >2m tall, so even though it's not very big in its 1st and 2nd years, it needs lots of room -- makes a nice yellow-green background plant. the leaves can be used as an herb, the roots as a vegetable, and the seeds as a spice much like fennel seed. it tastes strongly of celery (oddly, more so than celery itself), with a touch of anise. if you're familiar with "maggi", it tastes sorta kinda a bit like that, only... greener. the tea is anti-septic. supposedly it's also an aphrodisiac, but i cannot attest to that.

it's hard to find here; i've only ever seen it in one nursery (the same one where i got my wasabi).