"A special moisture sensor placed inside of the plant�s soil is made to detect when the foliage is lacking water. When the sensor detects that their is a lack of moisture for your plant, the Twitter Kit sends the information to the detection circuitry, which is easily built with your home solder kit. The data is then sent to the Internet using the devices onboard Ethernet connection. From there a notification can be sent to both Twitter, and wirelessly transmitted to your mobile device." http://www.coolest-gadgets.com/20080510/botanicalls-twitter-kit-keeps-your-plant-talking-in-140-characters-or-less/
It appears this network only allows plants to send data -- not receive. I understand the plants are already communicating with each other using their own organic pathways, but we still need a way to relay complex information back to them.
"We're kind of on the level of crossword puzzle writers... And no one ever goes to them and gives them an award." ~Joe Strummer sscce.org