Its a root weed, don't do it unless you have an area of land/soil that you don't care about as once started you will never get rid of it.
That being said, I grow horseradish, think of it as a weed. Water it - it will grow; don't water it - it will grow; give it full sun - it will grow; give it no sun - it will grow. No wind/high winds it will grow.
I could take pictures but it would be like me taking pictures of dandilions, the plant has large furn like leaves and the root is in the ground.
I put it in a pail, that I dug into the ground to contain it. I put holes in the side of the pail to allow drainage, the root found its way out of the pail and now grows all around the pail, feet away. The top 4 inches of soil is loam, the rest is clay. Not red clay like potatoes grow well in, but the white cement like clay and the root loves this cold clay.
Old wives tales says to process the root only in months that end in "r" (don't ask me why), I believe the theory is to process it after first frost but this theory may be North American based - there are many root plants that are to be processed after first frost(parsnip come to mind).
I make horseradish condiment, dig up the horseradish in October(and the roots can run very, very deep). I remove the greens, wash the roots and outside, I put the root into my food process and grind it up. You will want to be outside as the fumes would fill your house and if married, you can expect to get yelled at! Your eyes will water, your nose will run. I grind the root twice, first pass is to get a coarse grind, empty the food process into a plastic or wooden bowl, cover and put into the fridge, limit as much air exposure in the ground state as possible(it will lose its heat quality quickly if exposed to air too long). DO NOT USE METAL(the horseradish will turn brown/sickly grey colour - this includes any spoons. Once all prduct is ground, I then put the ground radish back into the processor with a white wine and white vinegar mix. Grind further to make a smoother consistancy, then spoon the end product into baby jars and into the fridge it goes.
Another old wives tale "to keep horseradish hot, keep it cold". Some even freeze it, I just keep it in a small fridge. Some say it keeps for several months, I have opened a jar that is a couple of years old and it was just good as the day I bottled it.
As for the leaves, I treat them like rhubarb leaves and consider them poisonous. I have heard mixed reviews on the leaves so I just don't use them to be safe.
Hope this fills your plate, here's a picture of my sauce: