Black Radish: A Natural Pharmacy in Your Garden

Black Winter Radish (Raphanus sativus niger) is a powerhouse of phytoncides and vitamins. Known for its spicy bite, it is indispensable in traditional medicine. The key to growing black radish is the timing of the sow. As a short-day plant, if sown too early in spring, it will bolt (flower) instead of forming a root.

Soil: Where Does Radish Get Its Spicy Kick?

Black radish needs dense yet fertile soil that retains moisture well.

• Best Choice: Fertile Loamy soils (Type 1) with a neutral pH.
• Soil Check: Perform the sausage test. If the soil rolls into a flexible stick (Type 1), it’s perfect: the radish will get enough water to avoid becoming woody.

Best Companions (Good)

• Cucumbers: Radish repels some cucumber pests, while the cucumbers provide shade from the harsh sun. Read our cucumber care and watering guide.
• Tomatoes and Eggplants: Coexist well on the same plot.
• Spinach: An excellent partner for intercropping.

Main Enemies (Bad)

• Walnut Trees: Walnut juglone makes the radish weak and prone to disease.
• Cabbage (All types): Share common pests (flea beetles) that can destroy the crop in days. See our cabbage companion planting guide.
• Drought: Without regular watering, black radish becomes hollow inside and unbearably bitter.

AgroPlanner Tip: For winter storage, black radish is usually sown in July. In our app, it occupies a 1x1 grid. The system helps you plan "second-wave" plantings after early greens and will definitely flag the walnut toxic zone in red.