Flavor-wise, grated horseradish is spicy — it only takes a tablespoonful to bring tears to your eyes. However, unlike spicy peppers, the reaction lasts only a few seconds; then your senses return to normal. Because it is not spicy until you cut into it, this plant finds itself unique in the world of vegetables and spices. When selecting a site for planting horseradish (Armoracia rusticana), look for a sunny area with rich, well-drained soil.