Out of the best Ivy stories ever told, Greg Rucka's "Fruit of the Earth" is the only one that gets into the best of lists and that's only by default being a part of the No Man's Land saga. Other great Ivy stories:
Batman/Poison Ivy: Cast Shadows by Ann Nocenti and John Van Fleet
Batgirl Annual #2 (When Pamela Gets the Blues) by Gail Simone and Robert Gill
Batman: Poison Ivy (1997 one-shot) by John Francis Moore and Brian Apthorp
All-Star Batman #7 by Scott Snyder and Tula Lotay
Special shout out to the Cycle of Life and Death mini by Amy Chu and Clay Mann