(chuckle) Sorry for the confusion. EF is for Eco-Friendly. The tips are meant to encourage ways to be environmentally friendly in your landscaping endeavors. Limited space available for post titles forces the use of acronyms.
When we made the move over from Cubits, the threads is various sub-forums were all combined into one Landscape Design forum here. There used to be a separate Eco-Friendly Design Tips sub-forum.