The important note was buried toward the end:
As the old saying goes, if you plant horseradish, make sure you never want to move it. Even the smallest piece of root left in the ground can re-sprout and form another hefty plant. Some people extend the bed into a border of handsome green leaves on one side of their herb or vegetable garden.
Whatever you do, don’t plant horseradish next to some polite plant that will be quickly muscled out of existence. Keep this ebullient root at a distance, like bamboo. And give it plenty of sun.
I'm not currently growing it, but I was told that it most emphatically should be grown in containers, to prevent it from taking over your whole garden like an underground kudzu. (I only wish someone had said the same to me about horse
tails which are running rampant on the east side of my house.
What is patriotism, but the love of good things we ate in our childhood?
-- Lin Yutang