Sylvetta, Perennial Arugula, Rucola selvatica, Wild Rocket
Perennial, and very heat-resistant arugula. Different species (Diplotaxis erucoides), same nutty, spicy flavor. A wild form of arugula, with very deeply lobed dark green narrow leaves grow steadily, reaching 3" in 3 weeks. Doesn't need great soil or full sun. Keep cutting and watering regularly for best flavor. Very deep-rooted--put this in a permanent bed, and cut regularly for salads. Leave a plant or two to make flowers--this is more loved by honeybees than anything I've ever grown. You can hear them the length of the garden. Self-sows strongly if you leave the flower stalks to make seedpods.
Will die back with freezing, and resprout quickly in spring. (Annual arugula, will stay greener in colder weather, but is less heat resistant.) I suggest using regular annual arugula for cold weather in the fall, and for very mild and succulent leaves in spring. This perennial arugula really shines as an extra-early crop, and as a spicy addition to salads all through the summer. Native to the Mediterranean; hardy to about zone 5, depending on drainage. Can be overwintered in a pot also. 200 seeds