For shade in a hurry, set your sights on a hybrid poplar. The tree can grow 30 to 40 feet in three years, topping out between 50 and 70 feet. Often planted by developers around new homes, a shade tree like this can increase the value of your property by thousands of dollars. And if that isn't reason enough, its foliage turns a brilliant yellow before shedding in autumn, yielding truly charming results year-round. Available on Amazon; $39 per 5-foot tree.