Odessa bellflower
Campanula glomerata var. Dahurica 'Odessa'
Zones 3-
8
6
USDA Hardiness Zone 6
-10 to 0°F • Moderate winter climates
Includes sub-zones: 6a, 6b | Ideal for: perennials, shrubs, ornamental trees | 5960 total plants
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Ohio buckeye
Aesculus glabra
Zones 3-
7
Ohio buckeye
Aesculus glabra 'Nana'
Zones 5-
9
Ohio horsemint
Blephilia ciliata
Zones 4-
8
Ohio spiderwort
Tradescantia ohiensis
Zones 4-
9
Okra
Abelmoschus esculentus 'Baby Bubba'
Zones 2-
10
Okra
Abelmoschus esculentus
Zones 2-
11
Old field goldenrod
Solidago nemoralis
Zones 3-
9
Olive-leaved gromwell
Lithodora oleifolia
Zones 6-
8
Onion
Allium altaicum
Zones 6-
9
Onion
Allium cepa
Zones 5-
10
Orange coneflower
Rudbeckia fulgida
Zones 3-
9
Orange daylily
Hemerocallis fulva
Zones 3-
9
Orange stonecrop
Sedum kamtschaticum var. Floriferum 'Weihenstephaner Gold'
Zones 3-
8
Orchid
Galearis spectabilis
Zones 4-
7
Oregano
Origanum vulgare 'Aureum'
Zones 4-
8
Oregano
Origanum 'Kent Beauty'
Zones 6-
9
Oregano
Origanum vulgare 'Aureum Crispum'
Zones 4-
8
Oregano
Origanum 'Hot and Spicy'
Zones 4-
8
Oregano
Origanum 'Bristol Cross'
Zones 5-
9
Oregano
Origanum vulgare 'Jim Best'
Zones 4-
8
Oregano
Origanum vulgare
Zones 4-
8
Oregano
Origanum 'Drops of Jupiter'
Zones 4-
9
Oregon grape-holly
Mahonia japonica
Zones 6-
8
Orienpet lily
Lilium 'American Heritage'
Zones 4-
8
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Orienpet lily
Lilium 'American Way'
Zones 4-
8
Orienpet lily
Lilium 'Touching'
Zones 4-
8
Orienpet lily
Lilium ORANIA
Zones 5-
9
Oriental arborvitae
Platycladus orientalis 'Elegantissima'
Zones 5-
9
Oriental arborvitae
Platycladus orientalis 'Collen's Gold'
Zones 5-
9
Oriental arborvitae
Platycladus orientalis 'Aurea Nana'
Zones 6-
9
Oriental arborvitae
Platycladus orientalis
Zones 6-
9
Oriental fountain grass
Pennisetum orientale 'Karley Rose'
Zones 5-
8
Oriental hornbeam
Carpinus orientalis
Zones 5-
7
Oriental lily
Lilium 'Casa Blanca'
Zones 5-
8
Oriental lily
Lilium 'Miss Rio'
Zones 5-
8
Oriental lily
Lilium 'Muscadet'
Zones 5-
9
Oriental lily
Lilium 'Black Beauty'
Zones 3-
8
Oriental lily
Lilium 'Miss Lucy'
Zones 5-
8
Oriental lily
Lilium 'Pink Heaven'
Zones 5-
9
Oriental poppy
Papaver orientale 'Patty's Plum'
Zones 3-
7
Oriental poppy
Papaver orientale 'Turkenlouis'
Zones 3-
7
Oriental poppy
Papaver orientale 'Beauty of Livermere'
Zones 3-
7
Oriental spicebush
Lindera angustifolia
Zones 6-
8
Oriental spruce
Picea orientalis 'Nigra Compacta'
Zones 4-
7
Oriental spruce
Picea orientalis 'Pendula'
Zones 4-
7
Oriental spruce
Picea orientalis 'Skylands'
Zones 4-
7
Oriental spruce
Picea orientalis 'Bergman's Gem'
Zones 4-
7
Oriental spruce
Picea orientalis 'Compacta'
Zones 4-
7
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Oriental spruce
Picea orientalis 'Instar'
Zones 4-
7
Oriental white oak
Quercus aliena
Zones 5-
8
Ornamental cabbage
Brassica oleracea (Ornamental Cabbage and Kale Group)
Zones 2-
11
Ornamental cherry
Prunus serrula
Zones 5-
6
Ornamental onion
Allium 'Globemaster'
Zones 5-
8
Ornamental onion
Allium thunbergii 'Ozawa'
Zones 4-
9
Ornamental onion
Allium 'Purple Sensation'
Zones 4-
9
Ornamental onion
Allium 'Millenium'
Zones 5-
8
Ornamental onion
Allium 'Sugar Melt'
Zones 5-
8
Ornamental onion
Allium giganteum
Zones 5-
8
Ornamental onion
Allium caeruleum
Zones 4-
8
Ornamental onion
Allium karataviense
Zones 4-
8
Ornamental onion
Allium schubertii
Zones 5-
8
Ornamental onion
Allium 'Serendipity'
Zones 4-
8
Ornamental onion
Allium 'Lavender Bubbles'
Zones 4-
8
Ornamental oregano
Origanum laevigatum 'Herrenhausen'
Zones 5-
9
Ornamental peach
Prunus persica 'Bonfire'
Zones 5-
8
Osage orange
Maclura pomifera
Zones 4-
9
Ostrich fern
Matteuccia struthiopteris
Zones 3-
7
Ostrich Fern
Matteuccia struthiopteris subsp. Pensylvanica
Zones 3-
8
Ouachita Mountain goldenrod
Solidago ouachitensis
Zones 6-
9
Ouachita Mountain leadplant
Amorpha ouachitensis
Zones 5-
7
Oval sedge
Carex leporina
Zones 4-
8
Overcup oak
Quercus lyrata
Zones 5-
9
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Ox eye
Heliopsis helianthoides var. Scabra 'Goldgefieder' GOLDEN PLUME
Zones 3-
9
Ox eye
Heliopsis helianthoides var. Scabra 'Sommersonne' SUMMER SUN
Zones 3-
9
Ox eye
Heliopsis helianthoides var. Scabra 'Burning Hearts'
Zones 3-
9
Ox-eye daisy
Heliopsis 'Helhan' LORAINE SUNSHINE
Zones 3-
9
Ox-eye daisy
Leucanthemum vulgare 'Maikonigin' MAY QUEEN
Zones 3-
8
Ox-eye daisy
Heliopsis helianthoides 'Tuscan Sun'
Zones 3-
9
Ox-eye daisy
Heliopsis helianthoides var. Scabra 'Spitzentanzerin' BALLERINA
Zones 3-
9
Ox-eye daisy
Telekia speciosa
Zones 3-
7
Oxeye sunflower
Heliopsis helianthoides var. Scabra 'Venus'
Zones 3-
9
Oxeye sunflower
Heliopsis helianthoides
Zones 3-
9
Oxeye sunflower
Heliopsis helianthoides 'Inhelsodor' TUSCAN GOLD
Zones 3-
9
Oxeye sunflower
Heliopsis helianthoides 'Fire Twister'
Zones 3-
9
Oyama magnolia
Magnolia sieboldii
Zones 6-
8
Ozark chinquapin
Castanea ozarkensis
Zones 5-
8
Ozark hairy corkwood
Leitneria pilosa subsp. Ozarkana
Zones 5-
9
Ozark phlox
Phlox pilosa subsp. Ozarkana
Zones 4-
9
Ozark witch hazel
Hamamelis vernalis 'Christmas Cheer'
Zones 4-
8
Ozark witch hazel
Hamamelis vernalis 'Carnea'
Zones 4-
8
Ozark witch hazel
Hamamelis vernalis 'Sandra'
Zones 4-
8
Ozark witch hazel
Hamamelis vernalis 'Lombart's Weeping'
Zones 4-
8
Ozark witch hazel
Hamamelis vernalis 'Autumn Embers'
Zones 4-
8
Ozark witch hazel
Hamamelis vernalis 'Purpurea'
Zones 4-
8
Ozark witch hazel
Hamamelis vernalis 'Washington Park'
Zones 4-
8
Ozark witch hazel
Hamamelis vernalis 'Squib'
Zones 4-
8
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Ozark witch hazel
Hamamelis vernalis 'Kohankie Red'
Zones 4-
8
Ozark witch hazel
Hamamelis vernalis
Zones 4-
8
Pacific Island silvergrass
Miscanthus floridulus
Zones 6-
9
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View all 5960 plants for Zone 6 with advanced filtering options. Search by plant type, sun exposure, water needs, and more.
See All PlantsBest Plants for Zone 6
USDA Hardiness Zone 6 experiences winter minimum temperatures between -10 to 0°F. This collection includes 5960 plants specifically suited for Zone 6 conditions, including perennials, shrubs, ornamental trees.
Understanding Your Hardiness Zone
The USDA hardiness zone is based on average annual minimum winter temperature. While it's an excellent starting point, also consider your local microclimate, soil conditions, rainfall patterns, and summer heat when selecting plants.