• EDAS Plant Study Group
  • Canberra Aquatic Plant Group
  • DFW Aquatic Plant Club
  • The Crypts Pages
  • Aquatic Gardeners Association
  • Steve's Aquatic Plant Resource Page
  • Tropica Aquarium Plants
  • Aqua Botanic's True Aquarium Plants
  • Aquarium Plant's Mailing List
  • Greater Washington Aquatic Plant Association (GWAPA)
  • Chicago Aquatic Gardeners Association (CAGA)
  • Aqua Design Amano
  • The Nature Aquarium
  • San Francisco Bay Area Aquatic Plant Society (SFBAAPS)
  • Chuck Gadd's excellent dosage calculator
  • Tom Barr's "Estimative Index" method
  • Tom Barr's "Estimative Index" method (HTML version)
  • All Wet Thumb Forums
  • Aquatic Plant Central