Ágnes Dénes (born May 31, 1931) is a Hungarian-born artist and a leading figure in conceptual, environmental, and ecological art.
Biography on Wikipedia: https://en.wikipedia.org/wiki/Agnes_Denes

The Living Pyramid by Ágnes Dénes
2015 / Wood, soil, grasses, and flowers / Height: 30′ / Socrates Sculpture Park, Long Island City, NY

Ágnes Dénes on Artnet: http://www.artnet.com/artists/agnes-denes/

Further reading:
http://www.agnesdenesstudio.com/index.html
https://www.architectural-review.com/essays/reputations/agnes-denes-1931
https://theshed.org/program/6-agnes-denes-absolutes-and-intermediates