Arugula nutrition facts. Arugula, also known as salad or garden rocket, is one of the nutritious green-leafy vegetable of Mediterranean origin. It is a small, low growing annual herb featuring dandelion like succulent, elongated, lobular leaves with green-veins.rugula, also known as salad or garden rocket, is one of the nutritious green-leafy vegetable of Mediterranean origin. It is a small, low growing annual herb featuring dandelion like succulent, elongated, lobular leaves with green-veins.