01
About trees Carlos Amorales, Ursula Biemann & Paulo Tavares, Merijn Bolink, Louise Bourgeois, Berlinde de Bruyckere, Mark Dion, Peter Doig, Valérie Favre, Anya Gallaccio, Rodney Graham, Katie Holten, John Isaacs, Naoko Ito, William Kentridge, Anselm Kiefer, Paul Klee, Rosemary Laing, Žilvinas Landzbergas, Ndary Lo, Paul McCarthy, Ana Mendieta, Agnes Meyer-Brandis, Paul Morrison, Shirin Neshat, Jill Orr, Renzo Piano, Pipilotti Rist, Ugo Rondinone, Julian Rosefeldt, Michael Sailstorfer, George Steinmann, Wolfgang Tillmans, Su-Mei Tse, Shinji Turner-Yamamoto
The earliest high-confidence catalog date in this author overview is 2015.