Local sites

• Northwest Garden and Society Clubs
• Portland Parks & Recreation: Growing Native Plants
• Classical Chinese Garden Garden of Awakening Orchid, Portland OR
• Gardening in Portland, Oregon
• Hoyt Arboretum
• Japanese Garden, Portland, OR
• Leach Botanical Garden, Portland, OR
• The Berry Botanic Garden

Metro sites

• Metro Natural gardening home page
  
• Metro Natural gardening seminars
  
• Composting
  
• Alternatives to pesticides

National Sites

• The American Association of Botanic Gardens & Arboreta 
• Good Nature Publishing
• Association of Zoological Horticulture