I'm not sure how well horseradish root from the Jewel will grow (it may be treated with something or too dry), but be aware that horseradish is very vigorous-- almost invasive. I planted some a while ago and it does spread laterally. One of my friends planted hers in a bed that already had mint-- like a cage match.
Chicago clay soil is not that great for nice roots either-- although I understand that a lot of the U.S. horseradish crop is grown in Illinois. I got my roots from Johnny's Seeds. If you want one of my volunteers, PM me your address and maybe we can work out a dropoff. Just promise not to blame me when it takes over!
Jen
P.S. Anyone want a lovage plant too?