Saw your episode and start thinking about gardening. Your garden is hooked up with pi or ardino that's hooked up with nutrions and ph watcher and when its time to water. Taken from the radiofrequncey episode your could hook the system up to wifi or if your garden is far away via the gsm modules and to not drain the celluar data its only trigged if needed.
P.S.
If you manage to create a system that warns of spanish slugs or any slug you should win the nobel prize of peace.