![]() Elevation of origin is an important aspect of your seed source. Seed zones are often defined by geographic features such as mountain ranges, river drainages, and major valleys. Seed zones have been established throughout the Pacific Northwest region they identify areas where growing conditions are similar (Figures 1a–d). When ordering trees, geographic seed collection zones and elevation of origin are useful criteria to help match environmental conditions of the seed source with those of your planting area. Thus, it is important to plant seedlings grown from seed collected from a location where the environmental conditions closely match those in your area. Trees are genetically adapted to the environment in their area of origin. For example, on a coastal site with moist soils and shade from standing trees, consider planting a shade-tolerant species such as western hemlock. Tables 1a-d show considerations for selecting species for reforestation in each major region of Oregon, including the coast, Willamette Valley, western Cascades, and southwest and eastern Oregon. See the USDA Natural Resources Conservation Service soil survey at. Soil surveys are a good source of information on site productivity and soil-site-species relationships.
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