The instructions from White Flower Farms, tell you to mound the dirt around your garlic as it sprouts and begins to grow. So what you have are little hills around your green sprouts. This photo shows the bed after the first frost. The instructions tell you to mulch the bed after the first frost to prevent the bulbs from heaving out of the ground. As the weather fluctuates and the ground freezes and then thaws, there is a danger of the cloves being pushed up out of the ground (heaving). Mulching keeps this from happening.