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Best time to sow your seeds

Abies balsamea Balsam fir 60 / 5° Early Sept Mid May 0.5
Acer tatarica Tatarian maple 45 / 5° Mid Oct Mid May 2
Acer negundo Manitoba maple 45 / 5° Mid Oct Mid May 2
Acer tegmentosum Snakebark Maple 120 / 5° Mid Oct Mid May 2
Aesculus glabra Ohio buckeye 60 / 5° Late Sept Mid May 5
Amelanchier alnifolia Saskatoon berry 120 days / 5 ° Early Aug Mid May 1
Betual papyrifiera Paper birch - Mid Sept or June Mid Sept or June 0.5
Caragana arborescens Caragana Water Soak 24 hrs Mid-Aug or June Mid-Aug or June 1.5
Cornus stolonifera Red-osier dogwood 70 / 5 ° Mid Sept Mid May 2
Cotoneaster acutifolia Cotoneaster 90 / 20° & 120 / 5 ° Late Aug Mid May 2
Crataegus arnoldiana Arnold hawthorn 90 / 20° & 180 / 5 ° Mid July Mid May 2.5
Elaeagnus angustifolia Russian olive 90 / 5 ° Mid Oct Mid May 2.5
Elaeagnus commutata Wolfwillow 90 / 5 ° Mid Oct Mid May 2.5
Fraxinus pennsylvanica Green ash 60 / 5 ° Mid Oct Mid May 1.5
Halimodendron halodendron Siberian salt tree 15 / 5° Mid Oct Mid May 1
Hippophae rhamnoides Seabuckthorn Water Soak for 48 hrs Mid Oct or Mid May Mid Oct or Mid May 1
Larix sibirica Siberian larch Water Soak 72 hrs Mid Oct or Mid May Mid Oct or Mid May 1
Malus baccata Siberian crab 30 / 5 ° Mid Oct Mid May
Picea abies Norway spruce - Mid Oct or Mid May Mid Oct or Mid May 1
Picea glauca White spruce - Mid Oct or Mid May Mid Oct or Mid May 1
Picea pungens Colorado spruce 30 /5° Mid Oct Mid May 1
Pinus contorta Lodgepole pine 60 / 5 ° Mid Oct Mid May 1
Pinus mugo Mugo pine 60 / 5 ° Mid Oct Mid May 1.5
Pinus ponderosa Ponderosa pine 30 / 5 ° Mid Oct Mid May 1.5
Pinus sibirica Siberian pine 60 / 20° & 120 / 5 ° Mid Aug Mid May 1.5
Pinus sylvestris Scots pine - Mid Oct or Mid May Mid Oct or Mid May 1.5
Prunus besseyi Sand cherry 140 / 20° & 90 / 5 ° Late July Mid May 2
Prunus cerasus Sour cherry 90 / 5 ° Late July Mid May 2
Prunus fruticosa Mongolian cherry 120 / 5 ° Late July Mid May 2
Prunus nigra Canada plum 120 / 5 ° Early Aug Mid May 3
Prunus pensylvanica Pin cherry 120 / 5 ° Late July Mid May 2
Prunus tomentosa Nanking cherry 150 / 5 ° Late July Mid May 2
Prunus virginiana Choke cherry 30 / 20° & 120 / 5 ° Late July Mid May 2
Pseudotsuga menziesii Douglas fir 60 / 5 ° Mid Oct Mid May 2
Pyrus ussuriensis Ussurian pear 60 / 5 ° Late Sept Mid May 2
Quercus macrocarpa Bur oak 120 / 5 ° Late Sept Mid May 3
Rosa woodsii Wood’s rose 90 / 20° & 120 / 5 ° Late July Mid May 1.5
Rosa rugosa x woodsii Hedge rose 90 / 20° & 120 / 5 ° Late July Mid May 1.5
Sambucus racemosa Red elder 90 / 25° & 120 / 5 ° Late July Mid May 1.5
Shepherdia argentea Silver buffaloberry 90 / 5 ° Mid Oct Mid May 2
Sorbus aucuparia European mountain ash 180 / 5 ° Late Sept Mid May 0.5
Symphoricarpus occidentalis Snowberry 120 / 25° & 180 / 5 ° Late July Mid May 1.5
Syringa reticulata Amur tree lilac 90 / 5 ° Late Sept Mid May 2
Syringa villosa Villosa lilac 60 / 5 ° Late Sept Mid May 2
Tilia americana American linden 150 / 5 ° Late Sept Mid May 2
Tilia cordata Littleleaf linden 90 / 25° & 90 / 5 ° Mid Aug Mid May 1.5
Ulmus americana American elm - Mid June Mid June 1.5
Viburnum lentago Nannyberry 150 / 25° & 150 / 5 ° Mid June Mid May 2
Viburnum trilobum Highbush cranberry 140 / 25 ° Mid June Mid May 2