Hi I'm Tricia an organic gardener from USDA's zone eight and I grew up eating horseradish we put in our potatoes, we grated it on sandwiches, we made a cream sauce out of it and if you like a wasabi rush you need to grow some horseradish.
The root of the horseradish is what you plant and it's actually what you eat. It grows down deep into the soil like a carrot. If you don't harvest the entire root then you'll grow another horseradish next year and the plant can become invasive year after year that's why i'm gonna plant mine in this Smart pot container it's easier to harvest that way too. Select a container thats at least fifteen gallons half barrels work well too and just fill it with a high quality potting soil. Im going to add this prime start booster blend into the hole before i plant the horseradish since the root is what we eat this will encourage a wonderful root system. Be sure and plant the root of the horseradish with the crown part facing up this is the part that's gonna grow the leaves. I'm only going to plant one horseradish root in this pot because the plant gets very big. If your using a wine barrel you might be able to squeeze in two. I'm going to put it in about five inches deep in the spring you'll want to fertilizer with a high phosphorus low nitrogen fertilizer like this "Doctor Earths Bud and Bloom Booster". Make sure it's free of weeds, water when it dries out, let it grow all summer and harvest it after the first frost.
It's the perfect time to harvest your horseradish. Gently dig out the plant be careful not to leave roots in the ground because they will grow and spread. Just snip off the green part about an inch from the root... ummm and then you wanna wash them off and put them in the crisper section in a plastic bag in your refrigerator and I'm going to go and make some horseradish sauce and grow organic for life!