I bought a horseradish plant 4 years ago, I was warned that it was a bit invasive -- mine is not!
I kind of forgot about it, it grew a few leaves in the first year, but the ground that I had planted it in had become a bit overgrown, and i didn't notice it for a couple of years. This year it has 4 leaves each about 18 inches long and 6 inches wide at the widest point. I am pretty sure that it is the horseradish plant because the leaves smell of horseradish when I rub them. I have now cleared all the weeds from around it, should I harvest it this year or leave it to become more established? I have very heavy clay soil and I don't think that I will be able to remove the root to inspect it without damaging it, and I don't want to wait another 4 years for another plant to grow (if I can find one, they are hard to come by around here)