Warm season turf grasses typically go dormant during the winter months, as temperatures drop and sunlight decreases. During this time, the grass will stop actively growing and may appear brown or yellow. Despite this, the grass is still alive and storing nutrients within the roots. As the weather begins to warm up in the spring, the grass will start to grow again and use the stored nutrients to fuel new growth. It is important to note that during the dormant period, it is not necessary to fertilize the grass as it is not actively growing and will not be able to utilize the nutrients. Instead, it is best to wait until the grass begins to green up again before applying any fertilizer.