Plant,Cultivar,Type,Hardy to Zone,Notes,Source
Ginkgo,'Autumn Gold',Shade tree (male clone),4,"Broad, symmetrical male; uniform gold fall colour; fruitless","Breeder, nursery & botanical-garden cultivar records; NRCan Plant Hardiness Zones"
Ginkgo,'Princeton Sentry',Shade tree (male clone),4,Narrow columnar (fastigiate) male; fruitless; for tight spaces,"Breeder, nursery & botanical-garden cultivar records; NRCan Plant Hardiness Zones"
Ginkgo,'Magyar',Shade tree (male clone),4,Upright pyramidal male with a strong central leader,"Breeder, nursery & botanical-garden cultivar records; NRCan Plant Hardiness Zones"
Ginkgo,'Jade Butterfly',Dwarf tree (male clone),4,"Compact, vase-shaped; distinctive butterfly-like leaves","Breeder, nursery & botanical-garden cultivar records; NRCan Plant Hardiness Zones"
Ginkgo,'Mariken',Dwarf tree (male clone),4,"Dwarf globe, often sold top-grafted as a standard","Breeder, nursery & botanical-garden cultivar records; NRCan Plant Hardiness Zones"
Ginkgo,'Troll',Dwarf tree (male clone),4,Very compact dwarf bun; containers/collectors,"Breeder, nursery & botanical-garden cultivar records; NRCan Plant Hardiness Zones"
Japanese maple,'Emperor I',Small tree,4b,Upright red; hardier than 'Bloodgood' by ~1 zone,"Breeder, nursery & botanical-garden cultivar records; NRCan Plant Hardiness Zones"
Japanese maple,'Sango Kaku' (Coral Bark),Small tree,4b,Coral-red winter bark; needs shelter from winter wind,"Breeder, nursery & botanical-garden cultivar records; NRCan Plant Hardiness Zones"
Japanese maple,'Beni Kawa',Small tree,4b,"Like 'Sango Kaku', slightly hardier","Breeder, nursery & botanical-garden cultivar records; NRCan Plant Hardiness Zones"
Japanese maple,'Mikawa Yatsubusa',Dwarf,4,Very compact dwarf; best container palmatum for Canada,"Breeder, nursery & botanical-garden cultivar records; NRCan Plant Hardiness Zones"
Japanese maple,'Bloodgood',Small tree,5,Standard upright red; struggles in Zone 4 without a sheltered site,"Breeder, nursery & botanical-garden cultivar records; NRCan Plant Hardiness Zones"
Japanese maple,'Osakazuki',Small tree,5b,Green leaves; the most vivid scarlet fall colour of any cultivar,"Breeder, nursery & botanical-garden cultivar records; NRCan Plant Hardiness Zones"
Dawn redwood,species,Deciduous conifer,5,"Fast, full-size; borderline Zone 4b in shelter; wants steady moisture","Breeder, nursery & botanical-garden cultivar records; NRCan Plant Hardiness Zones"
Dawn redwood,'Gold Rush' / 'Ogon',Deciduous conifer,5,Golden foliage; slower and smaller; give a sheltered site,"Breeder, nursery & botanical-garden cultivar records; NRCan Plant Hardiness Zones"
Dawn redwood,'Miss Grace',Deciduous conifer (dwarf),5,Weeping dwarf for a specimen spot,"Breeder, nursery & botanical-garden cultivar records; NRCan Plant Hardiness Zones"
Dawn redwood,'North Light' (Schirrmann's Nordlicht),Deciduous conifer (dwarf),5,"Slow, compact; cream-flushed new growth","Breeder, nursery & botanical-garden cultivar records; NRCan Plant Hardiness Zones"
Pawpaw,'NC-1',Fruit tree,5,"Cold-hardy, early-ripening, Ontario roots; tree hardy to 4b (fruit may not finish in coldest gardens)",Canadian rare-fruit grower & Peterson Pawpaw cultivar records; NRCan Plant Hardiness Zones
Pawpaw,'Sunflower',Fruit tree,5,"Vigorous, large fruit; more self-fertile (still plant two)",Canadian rare-fruit grower & Peterson Pawpaw cultivar records; NRCan Plant Hardiness Zones
Pawpaw,'Shenandoah',Fruit tree,5,Peterson selection; excellent flavour and texture,Canadian rare-fruit grower & Peterson Pawpaw cultivar records; NRCan Plant Hardiness Zones
Pawpaw,'Susquehanna',Fruit tree,6,"Peterson selection; large fruit, few seeds; best Zone 6+",Canadian rare-fruit grower & Peterson Pawpaw cultivar records; NRCan Plant Hardiness Zones
Pawpaw,'Mango',Fruit tree,5,Earlier ripening; useful insurance in cooler Zone 5,Canadian rare-fruit grower & Peterson Pawpaw cultivar records; NRCan Plant Hardiness Zones
Pawpaw,'Pennsylvania Golden',Fruit tree,5,Early ripening,Canadian rare-fruit grower & Peterson Pawpaw cultivar records; NRCan Plant Hardiness Zones
Hydrangea,'Limelight' (paniculata),Shrub,3,Panicle; chartreuse-to-pink; blooms on new wood (reliable bloom),"Breeder, nursery & botanical-garden cultivar records; NRCan Plant Hardiness Zones"
Hydrangea,'Little Lime' (paniculata),Shrub,3,Compact 'Limelight',"Breeder, nursery & botanical-garden cultivar records; NRCan Plant Hardiness Zones"
Hydrangea,'Quick Fire' (paniculata),Shrub,3,Earliest panicle bloomer (June),"Breeder, nursery & botanical-garden cultivar records; NRCan Plant Hardiness Zones"
Hydrangea,'Bobo' (paniculata),Shrub,3,Dwarf panicle,"Breeder, nursery & botanical-garden cultivar records; NRCan Plant Hardiness Zones"
Hydrangea,'Vanilla Strawberry' (paniculata),Shrub,4,White-to-strawberry-red panicles,"Breeder, nursery & botanical-garden cultivar records; NRCan Plant Hardiness Zones"
Hydrangea,'Annabelle' (arborescens),Shrub,3,Smooth hydrangea; blooms on new wood; stems can flop,"Breeder, nursery & botanical-garden cultivar records; NRCan Plant Hardiness Zones"
Hydrangea,'Incrediball' (arborescens),Shrub,3,Strong-stemmed 'Annabelle' — no flopping,"Breeder, nursery & botanical-garden cultivar records; NRCan Plant Hardiness Zones"
Hydrangea,'Endless Summer' (macrophylla),Shrub,5,Reblooming bigleaf mophead; borderline Zone 4 with a winter burlap wrap,"Breeder, nursery & botanical-garden cultivar records; NRCan Plant Hardiness Zones"
Rose,'John Cabot' (Explorer),Shrub/climber rose,3,Canadian-bred Explorer climber,"Agriculture & Agri-Food Canada rose breeding programs (Explorer, Parkland/Morden); NRCan Plant Hardiness Zones"
Rose,'William Baffin' (Explorer),Shrub/climber rose,3,Vigorous Explorer climber; survives to Zone 2 under snow,"Agriculture & Agri-Food Canada rose breeding programs (Explorer, Parkland/Morden); NRCan Plant Hardiness Zones"
Rose,'Champlain' (Explorer),Shrub rose,3,Recurrent red Explorer shrub rose,"Agriculture & Agri-Food Canada rose breeding programs (Explorer, Parkland/Morden); NRCan Plant Hardiness Zones"
Rose,'Henry Kelsey' (Explorer),Climber rose,3,Red Explorer climber,"Agriculture & Agri-Food Canada rose breeding programs (Explorer, Parkland/Morden); NRCan Plant Hardiness Zones"
Rose,'Morden Blush' (Parkland),Shrub rose,3,Parkland/Morden series; very long bloom,"Agriculture & Agri-Food Canada rose breeding programs (Explorer, Parkland/Morden); NRCan Plant Hardiness Zones"
Rose,'Prairie Joy' (Parkland),Shrub rose,3,Hardy Canadian-bred shrub rose,"Agriculture & Agri-Food Canada rose breeding programs (Explorer, Parkland/Morden); NRCan Plant Hardiness Zones"
Rose,'Winnipeg Parks' (Parkland),Shrub rose,3,Parkland series; compact red,"Agriculture & Agri-Food Canada rose breeding programs (Explorer, Parkland/Morden); NRCan Plant Hardiness Zones"
Rose,Rugosa (Rosa rugosa),Species shrub rose,2,Hardiest garden rose; salt- and wind-tolerant,"Agriculture & Agri-Food Canada rose breeding programs (Explorer, Parkland/Morden); NRCan Plant Hardiness Zones"
Lilac,Common lilac (Syringa vulgaris),Shrub,2,Among Canada's hardiest shrubs; needs winter chill (poor in Zone 7b+),"Breeder, nursery & botanical-garden cultivar records; NRCan Plant Hardiness Zones"
Lilac,Preston hybrids (S. x prestoniae),Shrub,2,Bred in Ottawa by Isabella Preston; late-blooming,"Breeder, nursery & botanical-garden cultivar records; NRCan Plant Hardiness Zones"
Lilac,"'Miss Kim' (Korean, S. pubescens)",Shrub,3,"Compact, fragrant; good fall colour","Breeder, nursery & botanical-garden cultivar records; NRCan Plant Hardiness Zones"
Lilac,Japanese tree lilac 'Ivory Silk' (S. reticulata),Small tree,3,Creamy-white June bloom; small street tree,"Breeder, nursery & botanical-garden cultivar records; NRCan Plant Hardiness Zones"
Clematis,'Jackmanii',Vine,3,"The Canadian workhorse; group 3, hard-prune each spring","Breeder, nursery & botanical-garden cultivar records; NRCan Plant Hardiness Zones"
Clematis,"alpina (Blue Dancer, Constance)",Vine,3,Spring species; very hardy; group 1,"Breeder, nursery & botanical-garden cultivar records; NRCan Plant Hardiness Zones"
Clematis,macropetala (Markham's Pink),Vine,3,Nodding spring flowers; very hardy,"Breeder, nursery & botanical-garden cultivar records; NRCan Plant Hardiness Zones"
Clematis,viticella 'Polish Spirit',Vine,4,Group 3; disease-resistant,"Breeder, nursery & botanical-garden cultivar records; NRCan Plant Hardiness Zones"
Clematis,'Nelly Moser' / 'The President',Vine,5,Large-flowered types; more reliable Zone 5+,"Breeder, nursery & botanical-garden cultivar records; NRCan Plant Hardiness Zones"
Magnolia,Star magnolia (M. stellata),Small tree,4,Early white stars; hardier than saucer types,"Breeder, nursery & botanical-garden cultivar records; NRCan Plant Hardiness Zones"
Magnolia,'Merrill' (M. x loebneri),Small tree,4,"Vigorous, white, fragrant","Breeder, nursery & botanical-garden cultivar records; NRCan Plant Hardiness Zones"
Magnolia,"Little Girl series (Ann, Jane, Susan)",Large shrub,4,Later bloom dodges late spring frost,"Breeder, nursery & botanical-garden cultivar records; NRCan Plant Hardiness Zones"
Magnolia,Saucer magnolia (M. x soulangeana),Small tree,5,Showiest; April bloom often caught by late frost in Zone 5,"Breeder, nursery & botanical-garden cultivar records; NRCan Plant Hardiness Zones"