I was reading laurengeary's
thread on protecting trees from harsh winters and thought I'd post my (in progress) list of zone 3 tolerant trees here for the benefit of all the cold climate loving folks out there. I'm not 100% sure that this list is correct or if many of the trees listed are even really suitable for bonsai. But I think it's a pretty good start...
Please point out any mistakes or provide additions if you feel like doing so.
-Cody
ZONE 3 TOLERANT TREES:
Acer ginnala Amur Maple
Alnus incana ssp. rugosa (A. tenuifolia) Thinleaf Alder
Andromeda glaucophylla Bog Rosemary
Artemisia filifolia Sand Sage
Artemisia frigida Fringed Sage
Artemisia nova Black Sage
Betula occidentalis Water Birch
Betula papyrifera Paper Birch
Betula pendula Eurpoean white birch, silver birch
Caragana arborescens Siberian Peashrub
Carpinus caroliniana (C. americana) American hornbeam
Cornus sericea var. sericea (C. stolonifera) Red-Osier Dogwood
Crataegus mollis Downy Hawthorn
Eleagnus angustifolia Russian Olive
Ginkgo Biloba Ginkgo
Juniperus scopulorum Rocky Mountain Juniper
Juniperus virginiana Eastern Red Cedar
Larix laricina American larch
Malus baccata mandshurica (M. cerasifera) Manchurian crabapple, Siberian crabapple
Malus 'Pink Spires' Pink Spires Crabapple
Malus sargentii Sargent's crabapple
Malus toringo (M. sieboldii) Toringo crabapple
Picea abies Norway spruce
Picea abies 'Maxwellii' Norway spruce, dwarf spruce
Picea engelmannii Blue Englemann spruce, dwarf Alberta spruce
Picea glauca white spruce
Picea pungens Blue Spruce
Pinus mugo Mugo Pine (Swiss Mountain Pine)
Pinus resinosa Red Pine
Pinus sylvestris Scots Pine
Pinus strobus Eastern white pine
Prunus americana American Plum
Prunus bessyi Sand Cherry
Prunus maackii Amur chokecherry
Prunus pennsylvanica Pin Cherry (Fire Cherry)
Prunus serotina Black cherry
Prunus tormentosa downy cherry, Korean bush-cherry, Nanking cherry, Chinese bush fruit, Tormentosa cherry
Prunus virginiana 'Shubert' Canada Red Cherry
Prunus x cistena 'Purpleleaf' Sand Cherry
Pseudotsuga menziesii var. glauca Douglass Fir
Quercus gambelii Gambel's Oak
Quercus macrocarpa Bur Oak
Ribes cereum Squaw Currant
Sheperdia argentea Silver Buffaloberry
Sorbus aucuparia European Mountain Ash
Sorbus aucuparia 'Michred' Cardinal Royal Mountain Ash
Sorbus decora Showy Mountain Ash
Sorbus scopulina Rock Mountain Ash
Syringa meyeri 'Palibin' Dwarf Korean Lilac
Tilia americana American Linden, Basswood