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Horseradish

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Add a spicy kick to your meals with horseradish (Armoracia rusticana)! This hardy, leafy perennial features large, deep-green leaves and a robust root system that grows underground, producing a strong, spicy flavour. Perfect for both gardens and pots, it thrives in cool to mild tropical climates and is frost-hardy and drought-tolerant once established, making it a resilient choice for various conditions. Whether you’re adding a zesty kick to sauces, meats, or pickles, horseradish delivers the spicy punch you crave. Packed with vitamin C and antioxidants, it’s not just a culinary delight but also a health booster. This low-maintenance plant comes back year after year, providing you with an ongoing harvest with minimal effort. Plant it once, and enjoy it for years to come! It’s a must-have addition to your garden and kitchen.

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Description

Horseradish
Horseradish (Armoracia rusticana) is a vigorous, easy-to-grow perennial root vegetable prized for its bold, spicy root. The long, tapering roots are grated fresh to add a zesty kick to sauces, meats, and pickles. Thriving in cool to mild tropical climates, horseradish grows year after year with minimal effort, making it perfect for home gardeners. The roots reach their full potential after their second year of growth, developing their best size and flavour. Once mature, they provide a robust harvest, perfect for all your culinary creations.

While the roots are the main attraction, young horseradish leaves are also edible. They can be used sparingly in salads or cooked dishes, offering a peppery flavour to complement the root’s intensity. Just a small handful of leaves goes a long way!

Health Benefits: Horseradish is rich in vitamin C, fibre, and antioxidants, and has been traditionally used to support digestion and reduce inflammation.

Planting Tip: Horseradish is vigorous and can spread easily. Plant in a contained bed or large pot to prevent it from outgrowing other plants or taking over your garden.

Climate & When to Plant
Plant horseradish in spring or autumn, choosing the best time for your climate:
• Cool to temperate climates: Best planted in spring once the risk of frost has passed.
• Subtropical climates: Plant in early spring or autumn to avoid extreme heat and wet summers.
• Arid and tropical climates: Plant in autumn, preferably toward the end of autumn when conditions are cooler and more suitable for establishment.
If your soil is too wet, frozen, or unworkable, store the root in a cool, dry place until conditions improve.

How to Plant
• Location: Full sun to part shade (especially in warmer regions).
• Soil: Loose, free-draining, rich in organic matter with a pH of 6.0–7.5.
• Planting depth: Place the rhizome horizontally, vertically, or at a 45-degree angle about 5 cm below the soil surface, depending on its shape. The crown should be positioned just below the soil surface, with any visible shoots or growing tips at or slightly above soil level so they remain exposed. This ensures new shoots can emerge easily and develop strong, healthy growth. Avoid planting too deeply, as this can hinder shoot emergence and development.
• Spacing: 50–70 cm between plants.
• Size: Horseradish can grow 1.2–1.5 metres tall and spread 90 cm wide.

Horseradish thrives in well-prepared soil or large pots. If planting in containers, use a pot at least 40 cm wide and deep.

Soil & Potting Mix
Horseradish grows best in loose, well-drained soil enriched with compost or well-rotted manure. For pots, use a premium vegetable potting mix with added compost.

Watering
Water well after planting and keep the soil consistently moist but not soggy, especially during the first growing season.
• Too much water can cause root rot, while too little can result in thin, woody roots.
• Once established, horseradish is drought-tolerant when grown in the ground but needs more frequent watering in pots, especially in dry weather.

Mulching
Apply mulch (straw, sugarcane, or lucerne) around the plant to conserve moisture and suppress weeds. Keep mulch away from the crown to prevent rotting.

Feeding Through the Season
Feed every 3–4 weeks with a balanced liquid fertiliser like seaweed or fish emulsion.
• Avoid high-nitrogen fertilisers or fresh chicken manure, as they promote leafy growth over root development.

Harvesting
Horseradish is best harvested in autumn, winter, or spring, in the plant’s second year, when the roots have had time to fully develop their size and flavour. A sign that the plant is ready is when the leaves change from a smooth, undivided shape to a more fern-like form with serrated, finger-like segments. As they begin to yellow and die back, the roots are mature and ready to lift. In cooler regions, waiting until after the first frost can intensify the root’s pungency and give it an extra kick of flavour. However, frost is not essential. Horseradish grown in frost-free climates will still develop a good, strong flavour when harvested at the right stage.

You don’t need to harvest the entire plant at once; simply dig up what you need and leave the rest in the ground to regrow the following season. Small root fragments left behind may also regrow, so it’s best to harvest gently to avoid spreading the plant where you don’t want it. After harvesting, remove the remaining leaves and stems to help the plant enter dormancy and encourage healthy regrowth. This also prevents unnecessary energy from going into flower and seed production. With yearly harvesting after the second season, horseradish will continue to produce tender, flavoursome roots for many seasons to come.

Storage
• Freshly dug roots can be stored in the fridge for several weeks.
• Alternatively, whole roots can be stored in an airtight freezer bag and kept in the freezer for up to a year. You can also grate and freeze the roots or store them in vinegar for year-round use.

Dividing Horseradish
Divide horseradish every 2–3 years during winter, when the plant is not actively growing. This helps maintain root quality and control the spread.

Pests & Diseases
Horseradish is generally pest and disease-resistant, but watch for:
• Root rot – Caused by poor drainage. Prevent by planting in well-drained soil.
• Aphids – Rinse off with water or use insecticidal soap.
• Flea beetles – Prevent by using row covers or neem oil.
• Leaf spot or rust – Remove affected leaves and improve air circulation.
Prevention: Ensure well-drained soil, avoid overhead watering, and provide proper spacing.

Companion Planting
• Good companions: Potatoes, strawberries (with proper spacing), rhubarb, asparagus, and Jerusalem artichoke.
• Avoid planting near: Beans and nightshades (e.g. tomatoes, eggplants) as they may compete for nutrients.

Safety
Horseradish is safe for culinary use in small amounts. It can be quite pungent when grated, so wear gloves if you have sensitive skin. Consuming large amounts may cause mild gastrointestinal discomfort, but using it in small quantities is safe. Keep out of reach of children and pets, and consult a healthcare provider if you have concerns about digestion or thyroid conditions.

Supplied as a dormant plant.

Additional information

Price Code

D – Purple Pack
Botanical Name

Armoracia rusticana
Quantity in Pack

1 Rhizome
Planting Time

Plant horseradish in spring or autumn, depending on your climate. Choose the cooler, milder months to help roots establish well and avoid extremes of frost, heat, or heavy rainfall.
Planting Depth

Horseradish rhizomes can be planted horizontally, vertically, or at a 45-degree angle, depending on their shape. As a guide, you can plant them the way they were packed, which often gives an easy indication of how they should sit in the soil. Plant the rhizome so it is roughly 5 cm deep in total, ensuring the crown sits just below the soil surface, with any visible growth or buds positioned at soil level and exposed. This helps new shoots break through easily, encouraging strong, healthy growth. Avoid planting too deeply, as this can hinder shoot emergence and development.
Planting Width

Ground Planting: Plant 50-70 cm apart.
For Pots: You can comfortably plant 1 to 2 new horseradish plants in a 40 cm pot.
Soil

Use loose, well-drained soil enriched with compost or well-rotted manure with a pH of 6.0–7.5. For pots, use a premium vegetable potting mix with added compost.
How to Plant

Plant horseradish in a full sun to partial shade position, ensuring it has adequate exposure to sunlight. In warmer climates, partial shade is beneficial, as afternoon shade helps prevent leaf scorching and stress from intense heat.
Choose to plant horseradish either in the ground or in pots. If planting in the ground, select an area where you can control its growth. This vigorous plant tends to spread, so it’s important to choose a bed where you’re comfortable with its growth. Be mindful that roots can easily be left behind in the soil when harvesting.
Once you've chosen your location, prepare the bed with loose, well-drained soil enriched with organic matter like well-rotted manure or compost. For pots, use a premium vegetable potting mix enriched with compost.
Next, space horseradish 50–70 cm apart in the ground or plant up to 2 horseradish roots in a 40 cm pot. Place the rhizome horizontally, vertically or at a 45-degree angle about 5 cm below the soil surface. The crown should be positioned just below the soil surface, with any visible shoots or growing tips at or slightly above soil level so they remain exposed. The crown should sit just below the soil, while the shoots or growing tips remain above the surface. This ensures the shoots have enough space to emerge easily and grow strong. Make sure not to plant too deeply, as this could hinder shoot development.
Cover with soil and firm down gently. Water generously to settle them in. Mulch horseradish to conserve moisture, suppress weeds, and protect the root zone. In cooler climates, mulch helps maintain soil temperature, while in warmer climates, it retains moisture and reduces heat stress. Just be sure not to cover the crown to allow for proper shoot development.
Watering

Horseradish likes consistent moisture, especially during its first growing season. Keep the soil moist but not soggy, as overwatering can lead to root rot. Once established, it becomes drought-tolerant but still benefits from deep watering during extended dry periods.
Division

Divide horseradish every 2–3 years during winter, when the plant is dormant and not actively growing. This helps maintain root quality and control its spread.

Additional Tips for Dividing Horseradish:

Choose healthy roots: Select only healthy, strong roots with visible crowns or buds for the best chance of successful regrowth.

Use sharp tools: Use a sharp knife or spade to make clean cuts and avoid damaging the roots.

Water well after replanting: Water generously after dividing and replanting to help the new sections settle in. Keep the soil moist, but not soggy, to support healthy growth.

Maintain space: To prevent overcrowding, space the divisions 50–70 cm apart when replanting in the ground. For pots, ensure the container is large enough to allow proper root expansion.
Fertilise

Horseradish doesn't need heavy feeding if the soil is well-prepared with organic matter like compost or well-rotted manure. To encourage healthy growth, feed every 3–4 weeks with a balanced liquid fertiliser such as seaweed, fish emulsion, or vegan-friendly organic fertilisers.

Avoid high-nitrogen fertilisers and fresh chicken manure, as they can burn the roots and promote leafy growth over root development.
Harvest

Horseradish is best harvested in autumn, winter, or spring once the leaves begin to yellow and die back, in the plant’s second year.

• In cooler climates, waiting until after the first frost can intensify the flavour, but even in frost-free regions, the roots will still develop a strong, pungent taste.
• You don’t need to harvest the entire plant—dig up only what you need and leave the rest in the ground to regrow next season.
• Horseradish can be left in the ground year-round across all climates, but in subtropical and mild tropical regions, applying mulch after harvesting helps protect the roots from excess moisture and temperature extremes.

If you prefer to harvest everything or discontinue growing horseradish, be sure to remove all large root pieces. Small root fragments left behind will regrow, so avoid digging too vigorously around the plant if you don’t want it to spread.
Storage

• Freshly dug roots can be stored in the fridge for several weeks. Do not peel the roots before storing—leave the skin on to help retain moisture and flavour.
• Whole roots can be stored in an airtight freezer bag and kept in the freezer for up to a year. Grated roots can also be frozen or stored in vinegar for year-round use.
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