| 2016 |
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| 2015 |
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| 2014 |
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| 2013 |
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| 2012 |
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| 2011 |
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| 2010 |
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| 2009 |
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| 2008 |
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- Fragrant Sumac
- Golden Hinoki Falsecypress
- Three-flowered Maple
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| 2007 |
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- Fringe Tree
Rhododendron 'Olga Mezitt'
- 'Little King' Dwarf River Birch
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| 2006 |
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- Weeping Katsura Tree
- Japanese Umbrella Pine
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| 2005 |
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- Korean Fir
- Korean Lilac
- Lowbush Blueberry
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| 2004 |
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- Soft Touch White Pine
- Three-toothed Cinquefoil
- Yellow Magnolia
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| 2003 |
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- Little Leaf Laurels
- Paperbark Maple
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| 2002 |
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- Seven Sons Flower
- Ken Janek Rhododendron
- Kousa Dogwood
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| 2001 |
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Pallida Chinese Witchhazel
- ‘Donald Wyman’ Crabapple
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Green Sheen Pachysandra
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| 2000 |
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- Ruby Spice Summersweet
- Brouwer’s Beauty Andromeda
- Japanese Tree Lilac
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| 1999 |
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- Bearberry
- Cornelian Cherry Dogwood
- Bl. Prince Holly
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| 1998 |
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- Climbing Hydrangea
- Winterberry Holly
- Magnolia ‘Leonard Messel’
- Russian Carpet Cypress
- Pinkshell Azalea
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| 1997 |
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- Weeping Alaska Cedar
- Redvein Enkianthus
- Large Fothergilla
- Star Magnolia
- Japanese Stewartia
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