A leafy green herb with a rich peppery flavor is Arugula, known as Rocket, Roquette, Rugula and Rucola. Generally used in green salads, Arugula can also be cooked as a vegetable and served with pastas and meats for a taste similar to spinach. For growing outdoors, the best time to sow Arugula seed is from April to early summer. Use fertile, well-drained soil and sow the herb seeds in a sunny location (dappled shades works well). Sow the herb seed successively, every 20 to 30 days, from spring through the first of summer. Thin the seedlings to 9 to 12 inches apart. Harvest the young leaves and the Arugula plant will continue to generate new leaves for weeks. In the heat of the summer, it is helpful to provide a shade cloth to protect the leaves and keep the taste mild.