Rare plants | Vegetable gardening | Commercial Hydroponics farming

Horse radish is actually a 'root herb'. It has a very strong & pungent aroma. One could say that it is like a highly concentrated aroma & taste of what we know of as radish. It is quite dark on the outside but comes out snow white after peeling. Horse radish is grown very extensively in the USA and Europe. Most of the produce is sold to manufacturers of prepared mustard to give that product more "heat" & pungency. It is my humble opinion that horse radish is ideally suited for the Indian palate! It is also used commonly to make wonderful sauces in continental cuisine. A piece of the root is planted to grow new plants. I have tried very hard but could not lay my hands on a 'planting root' for Horse radish. Can someone help please?