Arugula/Rucola/Rocket. Whichever name you use, arugula has become an essential ingredient in salads. It is nutty, spicy, and slightly peppery. Make frequent plantings every 2-3 weeks for continuous harvest, and cut it when the leaves are still small, 4-6 inches. Direct seed about 1 inch apart and arugula will be ready in just 38-40 days.