When to Plant Horseradish in Perth, Mediterranean Guide

Sow September to March. Right now in September you can sow.

Published · Last reviewed · By Garden Buddy
Growing advice is reviewed by hand. Planting dates, current conditions and prices on this page update daily.

This Horseradish guide is written for the Mediterranean zone, which takes in Perth, Adelaide and Bunbury. Somewhere else? Your postcode picks the right one.

Not your zone? Cairns Brisbane Sydney Melbourne Canberra Alice Springs

Also handy: will it frost this week? and what grows in shade.

Horseradish

Photo: Wikimedia Commons

Horseradish is a robust, hardy perennial grown for its pungent root. Once established, it is almost impossible to eradicate. A feature or a bug depending on your perspective. Best suited to temperate and cool climates where cold winters develop the best-flavoured roots. Extremely low maintenance but must be contained or it will take over the garden.

Planting Calendar for Mediterranean

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
D D D - - - - - D D D D

S = Seed Tray   T = Transplant   D = Direct Sow

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Current Growing Conditions

Soil temperature: 15.9°C (optimal range: 10–25°C) ✓ Ready to plant

Modelled from Open-Meteo forecast (Perth), not a live sensor.

How to Grow Horseradish in Mediterranean Australia

When to Plant

Plant March-May (autumn) or September-November (spring). Adelaide's cold winters suit horseradish well. Perth is more marginal.

Soil
Deep, loose, well-drained soil enriched with organic matter. Best roots form in sandy loam or loam dug to at least 30cm depth. Tolerates a wide range of soils but heavy clay produces misshapen roots. Remove stones.
pH Range
6.0-7.5
Sunlight
Full sun (6+ hours). Tolerates partial shade but root development is reduced.
Spacing
40cm apart, 60cm between rows
Watering
Moderate water needs. Water deeply once per week during active growth. Drought tolerant once established but consistent moisture produces the best roots. Reduce watering in winter when dormant.

Companion plants: Potato, Fruit trees, Grape vines

Avoid planting near: Other brassicas (shares diseases)

Mediterranean Growing Tips for Horseradish

Recommended Varieties

  • Common Horseradish
  • Bohemian

Key Challenges

  • Invasiveness
  • Dry summers needing irrigation
  • Perth's mild winters limiting pungency

Pro Tips

  • Adelaide is good horseradish country. Cold winters and reasonable rainfall
  • Perth gardeners: plant in the coolest, most sheltered spot available
  • Contain in all climates. Horseradish is aggressively persistent

Harvesting Horseradish

When ready: Harvest after the first frosts of autumn/winter, or at least 16-24 weeks after planting. Roots should be at least 30cm long and 3-5cm diameter at the crown. Leaves may have died back partially in cold climates.

How to harvest: Dig deeply alongside the root with a garden fork. Roots can go 60cm+ deep. Lever out carefully. Any root fragment left in soil WILL regrow, so be thorough if you want to contain the plant. Snap off side roots for replanting or discard in bin (not compost).

Common Horseradish Pests in Mediterranean Zones

Fungal Pathogens, risk: MODERATE (score: 51/100)

Organic prevention: Horseradish is so vigorous that pest damage is rarely significant. Focus control efforts on neighbouring brassica crops instead.

View all pest alerts →

Where to next

Also worth sowing in the mediterranean zone this September: Ginger, Beetroot, Chilli Peppers and Cucumber.

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Common Questions About Horseradish

When do you plant horseradish in Australia?

It depends on your climate zone, not the calendar month alone. Planting months by zone:

Does horseradish grow all year round in Perth?

No. In the Mediterranean zone the planting months are Jan to Mar, Sep to Dec. Outside that window it either bolts, sulks or gets cut down by the weather.

Which zone am I in?

Type your postcode into the box under the heading and the page tells you, and links this crop in your own zone if it differs. Or look it up on the grow zone map. This page is the Mediterranean zone, Perth is its reference city.