The wild garden movement, with roots dating back to the 1850's, is very popular today thanks to the renewed appreciation for the benefits of native plants. Usually planted in naturalistic drifts, these gardens are in tune with the sustainability of the planet - native plants are well suited to their environments requiring no extra watering, fertilizers, or chemical sprays. Piet Oudolf designed beautiful gardens along the Maas riverfront in Rotterdam, the Netherlands. These photos highlight his use of Helenium, Allium, and Hyssup.