What is the new perennial movement? Fifth topical link.

https://www.homesandgardens.com/gardens/what-is-the-new-perennial movement 

This discusses the work of Piet Oudolf.

Extract taken from link:- "Popularised in the 1990's by author Noel Kingsbury in his book The New Perennial Garden, the work of Wisconsin based Roy Diblik and Dutch plantsman and designer Piet Oudolf this planting style celebrates ephemeral and natural beauty of perennial plants and showcases their seasonal life cycle from fresh growth in the Spring, vibrant Summer blooms through to their seedheads and decline in fall. The key to the success of this nature-led look is to select plants suited to the local soil and climate and to arrange them to create impact and a gentle tableau of everchanging color, texture and seasonal interest."

"Dutch plantsman and landscape designer Piet Oudolf is often charged with popularising this gardening style, creating renown (ed) gardens, including the High Line, NYC and Lurie Garden, Chicago.  Using his intimate knowledge of plants and their habits, he carefully curates so-called plant communities where different grass and perennial varieties happily co-exist and need little intervention.  The result epitomises the seasonal ebb and flow of a wild prairie or  flowering meadow artfully contained within sharply cut hedging or clean (lines?, word missed out in extract).