Gardening Zones in Oregon

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The US Department of Agriculture (USDA) divides the country geographically into zones in which specific plant life can be grown, or Plant Hardiness Zones. Zones are determined according to average winter low temperatures. The zones are identified by numbers 0 through 12, and each zone has a or b indicators, noting small differences in temperature averages. The temperatures for different zones range from negative 65 degrees Fahrenheit, to above 55 degrees Fahrenheit. The US currently contains land in Zones 3 though 11. Oregon ranges from USDA Zone 4a to USDA Zone 9b.

USDA Zone 5, a and b

This zone covers -20 degrees to -10 degrees Fahrenheit. Zone 5 covers much of the Eastern and middle regions of Oregon.

Plants recommended for this zone include:

Acer palmatum (Japanese maple) Cornus florida (flowering dogwood) Cotoneaster microphyllus (small-leaf cotoneaster) Deutzia gracilis (slender deutzia) Euonymus fortunei (winter-creeper) Rosa multiflora (multiflora rose)

USDA Zone 6, a and b

USDA Zone 6, a and b, is also found on the Eastern side of Oregon, but in the less mountainous, lower altitude regions. It covers -10 degrees Fahrenheit to 0 degrees Fahrenheit. The major city of Bend, Oregon, falls in Zone 6.

Plants recommended for this zone include:

Buxus sempervirens (common boxwood) Cedrus atlantica (Atlas cedar) Hedera helix (English ivy) Ilex opaca (American holly) Ligustrum ovalifolium (California privet) Prunus laurocerasus (cherry-laurel) Taxus baccata (English yew)

USDA Zone 7 a and b

USDA Zone 7 covers 0 to -10 degrees Fahrenheit. Only a small strip down the mid-Western section of Oregon is included in Zone 7.

Some plants recommended for this zone are:

Acer macrophyllum (bigleaf maple) Rhododendron Kurume Group (Kurume azalea) Ilex aquifolium (English holly)

USDA Zone 8, a and b

USDA Zone 8 covers the temperature range of 10 to 20 degrees Fahrenheit. Zone 8 covers much of Western Oregon, from north to south. It encompasses many major cities, including Eugene, Medford, Portland and Salem.

Some plants recommended for this zone are:

Arbutus unedo (strawberry-tree) Choisya ternata (Mexican orange) Olearia x haastii (New Zealand daisy-bush) Pittosporum tobira (Japanese pittosporum) Viburnum tinus (laurustinus)

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