Plant ferns in swamps or low lying places and watch them grow by leaps and bounds. Ferrns also are hardy in zones 4-9 and due to their ability to withstand drought and freezes, people in cooler climates than zones 4 have often had great success with them also. Native fern plants are best sellers like the Christmas Fern. It's an evergreen fern that the top foliage stays green on year round. Another favorite is the fiddlehead fern . It's an edible delicatessan in France and Europe for Salads and as a main course also.