Pines and oaks are the most common native trees on Long Island. There are two species of pines, pitch and white, and at least seven species of oaks. Oak trees are long-lived — white oaks such as those on Gardiner’s Island can live to 400 or 500 years, equaling the longevity of white pines, while pitch pines, which George Washington called “ill thriven” on his one trip here, are lucky if they make it to the century mark.