Arugula (Eruca vesicaria) is sometimes called rocket or roquette. Long popular in France and Italy, the leaves of arugula provide a spicy zap when added to a salad. This is the same plant sold in cellophane bags in the grocery store and usually labelled 'baby arugula.' You can also saute or steam the leaves like spinach or other leafy greens. Plants look a little like dandelions, but are bigger and more open. Leaves grow best in cool weather. Leafy plants grow 6 to 12 inches tall while in the harvest stage. Arugula should be planted in the garden in early spring or fall. It will grow in a rosette about a foot wide and equally tall. Like leaf lettuce, mustard, or collards, arugula stretches skyward in hot weather, blooming and setting seeds. You can pull it up when plant start to send up a bloom stalk from the center, or you can continue harvesting the leaves until they taste too strong. Some gardeners cut the plants back to get another harvest as it tries to grow back. The bloom stalks may grow 24 to 36 inches tall and have little white flowers on top. These are edible and look pretty in a salad. Flowering signals that the season is ending for arugula and you can replace it with a warm weather crop, unless you want to try cutting it back and eating it just a little longer.