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2008 Geranium 'Rozanne' |
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2007 Nepeta faasenni 'Walker's Low' |
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2006 Dianthus 'Firewitch' |
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2005 Helleborus 'Winter Queen' |
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2004 Athyrium niponicum 'Pictum' |
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2003 Leucanthemum 'Becky' |
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2002 Phlox 'David' |
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2001 Calamagrostis 'Karl Foerster' |
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2000 Scabiosa 'Butterfly Blue' |
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1999 Rudbeckia 'Goldsturm' |
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1998 Echinacea 'Magnus' |
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1997 Salvia 'May Night' |
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1996 Penstemon 'Husker's Red' |
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1995 Perovskia atriplicifolia |
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1994 Astilbe 'Sprite' |
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1993 Veronica 'Sunny Border Blue' |
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1992 Coreopsis 'Moonbeam' |
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1991 Heuchera 'Palace Purple' |