Consider the geranium the ultimate multipurpose spring plant. Perhaps you've seen geraniums spilling over a window box. Their red, pink, blue, purple and other bright colors are hard to miss. But these bold beauties also make great garden borders, and you can use them to fill in as ground cover or to decorate rock gardens. "Geranium" is an umbrella term that includes an eclectic group of flowers, annuals and perennials. Some kinds enjoy sun and grow to be several feet tall, while others like shade and stay low to the ground. Despite these differences, geraniums are characterized by their ease of care and ability to multiply readily, as well as their resistance to deer. When planting geraniums, make sure the hole you dig is twice the size of the pot. Once the plant has flowered, cut it back to stimulate new growth.