While it’s quite possible you’ve tasted horseradish (Armoracia rusticana) and appreciated its sinus-clearing and deliciously flavorful bite, has it ever occurred to you to grow it?
How fun would it be to mix up a batch of Bloody Mary drinks for your brunch guests, using your own homegrown horseradish?
Pair those classic morning drinks with some peeled and cocktail-sauced shrimp, also featuring your new crop, and your guests will be in awe.
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In addition to being popular in the kitchen, the horseradish plant has its fans — and a history — in the medicinal plant world, too.
Let’s learn more about this plant’s many uses, and then get down to business with the planting and harvesting.
The exact origins of the plant are unknown, but evidence suggests that Egyptians knew of this spicy, edible root 3000 years ago, and ancient Greeks believed it to be an aphrodisiac.
The plant also plays a historic role in the Passover Seder plate, an important tradition of the Jewish faith that continues to this day.
This aromatic came to North America during the time of European colonization, with commercial production beginning in the mid-1850s.
The leaves, flowers, and roots of this plant have been used medicinally throughout history.
The leaves are said to be an analgesic, the flowers are made into a tea that is said to fight colds, and a compound in the root has been shown to have antibacterial properties.
And while we’d most typically refer to the root as a vegetable, the medicinal and culinary applications of the leaves and flowers lead many gardeners to call the plant an herb.
A Note on Wasabi
Wasabi, sometimes called Japanese horseradish, is actually a totally different plant: Wasabi japonica.
In North America, of course, we know wasabi as the fiery accompaniment to sushi and sashimi. But because true wasabi is very difficult to cultivate outside of Japan, what is sold and served here is very rarely the real deal.
Instead, we usually get ground horseradish mixed with green food coloring and other flavorings.
Varieties: Not Much Choice
Horseradish is divided into two general types. The “common” type has broad, crinkled leaves and what’s generally considered a superior quality of root.
“Bohemian” types have narrow, smooth leaves and somewhat lower root quality, but offer better resistance to white rust disease.
According to the University of Wisconsin Extension, specific varieties are rarely available to home gardeners, other than the ornamental “Variegata.”
In fact, sourcing this somewhat elusive product to plant can be a bit tricky; your best bet is to find an online source, as most garden centers will not have this item.
Tennessee-based Grower’s Solution sells organic horseradish root stock, available on Amazon.
In contrast to its spicy-hot nature, this plant is fond of cool conditions. It does well in zones 2-9, but time your plantings according to local weather patterns.
It prefers daytime high temperatures ranging from 45 to 75°F, but it is ready to harvest only after a frost has killed the leaves, so take that into consideration.
Before planting, thoroughly and deeply incorporate 4-6 inches of organic matter and 2 ounces of all purpose, granular fertilizer (16-16-8) per square yard of planting area, according to Utah State University Cooperative Extension.
Plant sun-loving horseradish in rich, loose, well-drained soil with a pH of 5.5 to 6.8.
Keep in mind that this plant can be invasive, so pick a spot carefully, or plant in a container.
Another consideration: the plants can grow to as tall as 3 feet, and their large leaves may shade out surrounding vegetation.
Plant at an Angle
Horseradish is propagated through crowns or pencil-sized root cuttings, which are sometimes called “sets.”
Utah State recommends you cut the thicker end square and the other end on an angle.
Space the sets one foot apart, setting them at a 45-degree angle, with the square-cut end higher than the angled end. Make sure that the square cut ends are all facing in the same direction, recommends University of Minnesota Extension.
Cover the sets with 2 to 3 inches of soil.
Not Too Much, Not Too Little
Horseradish is quite drought tolerant, but the roots can become woody and weak-flavored if they go too long without water.
If rain is scarce, give the plants 1 to 2 inches of water once a week. But take care not to give them too much water, because the roots will become soft and have a bitter flavor.
Four and eight weeks after planting, apply one teaspoon of nitrogen (21-0-0) to each plant.
You can mix the nitrogen with water and apply it as a solution, or you can simply sprinkle granular nitrogen around the base of your plants and water it in.
Keep the planting area as free of weeds as possible, and pluck off any brown leaves.
And speaking of leaves, you can actually harvest the tender, young ones and add them to salads for a slightly spicy kick.
If your plants go to flower, just enjoy the show. There’s no reason to pinch them off as with other herbs.
Relatively Pest Free
This plant can be susceptible to various foliar diseases, such as white rust, which can be treated with fungicides.
Root rot can occur if the plants are overwatered.
Sand and Sawdust
Harvest the long, white, tapered roots in late fall or winter, once frost has killed the leaves. With luck, this will be just in time to make a fabulous sauce for a holiday prime rib.
Alternatively, if you like more spice, you can harvest in early spring just before new sprouts form.
Gently dig up your plants and cut off the large, thick roots to use. Leave some of the smaller root pieces in the soil to start new plants for the next year.
You can keep them in the refrigerator for a few weeks. Or store in damp sand or sawdust in a cool, dark cellar for up to 10 months.
Prep and Storage
When you’re ready to consume the roots, peel and grate them. Or you can chop them into 1-inch chunks and run them through a food processor.
Grated horseradish can be kept in an airtight container in the refrigerator for one to two weeks.
Add 2-3 teaspoons vinegar or lemon juice per cup of grated horseradish to further extend the shelf life of the product.
Note that adding vinegar immediately reduces the pungency of the root. Also consider opening windows or doors as you cut or grate the horseradish root, because the aroma is quite strong.
There are so many delicious ways to consume this spicy root.
First, enhance your cocktails — of either the beverage or shrimp variety — with homegrown horseradish. Your parties will be standing-room only.
Spicy Bloody Mary
Foodal’s spicy Bloody Mary recipe is a great place to start, especially if you’re a fan of DIY (and if you’re growing hot peppers and tomatoes in the garden this season alongside the horseradish…).
In addition to this flavorful homegrown root, you’ll love juicing your own garden tomatoes and infusing vodka with backyard jalapenos to prep and serve this craft cocktail at your next brunch gathering.
Healthier Potato Salad
Horseradish adds a tangy zing to this healthier version of a classic potato salad from Brynn McDowell.
What makes it healthy? Greek yogurt is used in place of the usual calorie-laden mayo.
Learn how to make this tasty side from The Domestic Dietitian.
Prepared at Home
Though the previous recipe calls for the “prepared” version of this stuff, fresh is always best.
Jordan and Clark Cord share their simple recipe to make your own at home, in the food processor.
You can find the recipe on The Fitchen.
Chestnut Beer Braised Short Ribs
You’ll also love this spicy gremolata made with fresh horseradish, a delicious homemade condiment served atop Katherine and Edwin D’Costa’s delicious short ribs.
Feel free to change up the proteins – it’s also delicious on fish, or served with hummus.
A Multi-Purpose Plant
The many gifts of horseradish include attractive foliage, medicinal leaves and flowers, and a one-of-a-kind punch of flavor from the root.
There are so many benefits to growing it in your own backyard – and you’ll love the pungent punch of flavor that it adds to beverages, condiments, and your favorite dishes!
Have you ever grown horseradish? Any tips for others thinking of taking the plunge? Please share in the comments section below.
Photo credit: Shutterstock, unless otherwise noted. With additional writing and editing by Allison Sidhu.
The staff at Gardener’s Path are not medical professionals and this article should not be construed as medical advice intended to assess, diagnose, prescribe, or promise cure. Gardener’s Path and Ask the Experts, LLC assume no liability for the use or misuse of the material presented above. Always consult with a medical professional before changing your diet or using plant-based remedies or supplements for health and wellness.
About Gretchen Heber
A former garden editor for a daily newspaper in Austin, Texas, Gretchen Heber goes through entirely too many pruners and garden gloves in a year’s time. She’s never met a succulent she didn’t like and gets really irritated every 3-4 years when Austin actually has a freeze cold enough to kill them. To Gretchen, nothing is more rewarding than a quick dash to the garden to pluck herbs to season the evening meal. And it’s definitely time for a happy dance when she’s able to beat the squirrels to the peaches, figs, or loquats.