Piet Oudolf (Dutch pronunciation: [ˌpit ˈʌu̯dɔlf]) (born 27 October 1944 in Haarlem) is an influential Dutch garden designer, nurseryman and author. He is a leading figure of the "New Perennial" movement, using bold drifts of herbaceous perennials and grasses which are chosen at least as much for their structure as for their flower colour.
His books include Gardening With Grasses (1998) (with Michael King and Beth Chatto), Dream Plants for the Natural Garden (2000) and Planting the Natural Garden (2003) (both with Henk Gerritsen), Designing With Plants (1999), Planting Design: Gardens in Time and Space (2005) (both with Noel Kingsbury) and Landscapes in Landscapes (2011), Planting: A New Perspective (Timber Press, 2013), and the most recent, Hummelo: A Journey Through a Plantsman's Life (2015) (with Noel Kingsbury).
- High Line (New York City, 2006),
- Battery Park (New York City, 2003),
- ABN Amro Bank (Netherlands, 2000),
- Hoogeland (Netherlands, 2001),
- the Lurie Garden, a gigantic green roof over the car park of Millennium Park (Chicago, 2003 - with Kathryn Gustafson)
- Scampston Hall (England, 2002-2003).
- Millennium Garden at Pensthorpe Nature Reserve
- Country Cork Garden, Republic of Ireland
- Parts of Kurpark Bad Driburg, Germany
- Municipal park of Enköping, Sweden
His own garden, at Hummelo, near Arnhem in the Netherlands has been created since 1982. It has gone through many changes which reflect Oudolf's constantly developing planting design. Initially it was designed with a series of yew (Taxus baccata) hedges and blocks, reflecting Oudolf's architectural style which owed much to Mien Ruys, the designer who dominated Dutch garden design in the post-war period.