I'm looking at passive automatic watering systems for a hanging basket. By the way, I use passive to mean non-electrical and non-mechanical.

The scheme I have in mind is to supply drippers in the basket from my water butt. The butt is about 2m above the basket.

WhatI need is something to regulate the water flow depending on the soil moisture. I've seen the Tropf Blumat Ceramic Cone system - does it work?

See - http://www.blumat.at/Weninger_engl/seiten_engl/frameset1_engl.html

Thanks
Richard