Arugula, also known as rocket or roquette, is a cool-season leafy herb commonly served in salads or on top of pizzas. Arugula seeds are fast-growing and easy to grow. It is best to harvest the leaves when they are young and tender because they will give the most flavour with little spice. Looking for Common Arugula? Get Astro Arugula. Want something a little spicier? Try some Wasabi Arugula!