Symphyotrichum dumosus Peter Harrison
2024
Helleborus
2023
Persicaria
2022
Anemone
2021
Penstemon
2020
Amsonia
2019
Baptisia
2018
Astrantia
2017
Geranium
2016
Veronicastrum
2015
Phlox
2014
Salvia
2013
Aster
2012
Nepeta
2011
Campanula
2010
Helenium
2009
Echinacea
2008
Leucanthemum
2007
Veronica
