Where to get them
The following are not available in Canada: Malus ‘White Candle', Prunus x hillieri ‘Spire', Thuja occidentalis ‘Elegantissima'.
KEY: Acer x freemanii ‘Armstrong': 1, A. platanoides ‘Crimson Sentry': 2, A. rubrum ‘Karpick': 3, A. saccharum ‘Newton Sentry': 4, A. s. ‘Temple's Upright': 5, A. s. ssp. nigrum ‘Green Column': 6, Chamaecyparis lawsoniana cvs.: 7, Crataegus monogyna ‘Stricta': 8, Fagus sylvatica ‘Dawyck': 9, F. s. ‘Dawyck Gold': 10, F. s. ‘Purple Fountain': 11, Ginkgo biloba ‘PNI 2720': 12, Juniperus chinensis ‘Fairview': 13, J. communis ‘Pencil Point': 14, J. scopulorum ‘Blue Arrow': 15, J. s. ‘Skyrocket': 16, Malus ‘Mazam': 17, M. ‘Pink Spires': 18, M. baccata ‘Columnaris': 19, Populus x canescens ‘Tower': 20, P. tremula ‘Erecta': 21, Prunus serrulata ‘Amanogawa': 22, Pyrus calleryana ‘Capital': 23, P. c. ‘Glen's Form': 24, Quercus robur forma fastigiata: 25, Sorbus x thuringiaca ‘Fastigiata': 26, Thuja occidentalis ‘Fastigiata': 27, T. o. ‘Unicorn': 28, T. o. ‘Yellow Ribbon': 29, Tilia americana ‘Fastigiata': 30, T. cordata ‘Greenspire': 31.
Art's Nursery Ltd.: 7, 10, 11, 22, 27, 31.
Au Jardin de Jean-Pierre: 2, 6, 11, 15, 20, 21, 31.
B. Dinter Nursery Ltd.: 9, 11, 12, 22, 24, 26,
Boughen Nurseries Valley River Ltd.: 21, 31.
Bradford Greenhouses Garden Gallery: 2, 10-12, 16, 18, 21, 25, 26, 31.
Centre du Jardin Deux-Montagnes Inc.: 1, 3, 12, 15, 27, 31.
Connon Nurseries: 1, 2, 10-12, 18, 28, 31.
Corn Hill Nursery Ltd.: 34.
Dutch Growers Garden Centre Saskatoon: 15, 16, 18, 21, 32, 34.
Greengate Garden Centres Ltd.: 18, 20-22, 28.
Hortico Inc.: 2, 10, 12-14, 16, 18, 27, 28, 33.
Humber Nurseries Ltd. & Butterfly Conservatory: 1, 2, 4, 8-14, 16, 18, 19, 21-23, 25, 26, 31.
Pickett's Nurseries: 1, 3, 11, 21, 31.
Rideau Woodland Ramble: 4, 11, 15, 16, 25, 27, 29, 31.
The Root Cellar: 1, 2, 7, 11-15, 18-20, 24, 27, 28.
Read more in Plants and Trees and Shrubs
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