1. Hydroponics Dictionary
A useful hydroponics calculator to help your hydroponic grow. Includes calculators for grow light wattage, grow light energy costs, EC or PPM conductivity, temperature conversion, air exchange, and a carbon dioxide calculator.
http://www.hydroponicsdictionary.com
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Rating: 0.00 | Votes: 0 | Date: Jul 14, 2008

2. International Code of Nomenclature for Cultivated Plants
ISHS, International Society for Horticultural Science, International Cultivar Registration Authorities List.
http://www.ishs.org/sci/icralist/icralist.htm
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Rating: 0.00 | Votes: 0 | Date: May 15, 2004

3. The Professional Gardeners Guild
An organisation for gardeners employed in private gardens and estates. Based in the UK with members in European countries and the United States.
http://www.pgg.org.uk/
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Rating: 0.00 | Votes: 0 | Date: May 15, 2004