There sits a plant in a old rose garden that has tulips. It has huge
leaves and being in an old garden I was expecting it to flower last year
as some sort of flowering plant that I was unfamilar with. It never
flowered last year and so I cut it to the ground. It is up this year and
was watching Garden Line when horseradish was mentioned and it
immediately rung a chord that maybe I have horseradish over there. Why
would anyone plant horseradish into a rose and tulip bed?

But first I need to positively identify whether this is horseradish.
Anyone have a positive I-D method?