I highly recommend Bruno Tree Care if you need trees taken down or pruned.
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The International Society of Arboriculture (ISA) site provides consumer information including the ablity to look up arborist certification.
The World Forestry Center in Portland promotes education about our world forests and trees, and their importance to all life for a sustainable future.
The Oregon Gardens displays thousands of plants in more than 20 specialty gardens. It is a favorite tourist destination that shouldn't be missed. www.oregongarden.org
OSU: Common Trees of the Pacific Northwest is a great site to learn about specific characteristics of trees and it provides detailed photos.
Aurora Landscape offers some of the best landscaping design and construction that we know of between Portland and Salem. We highly recommend them!