A plant feeder includes a reservoir container, a stand supporting the container, a fluid feed line, and a flow control valve. The reservoir container provides a source of fluid nourishment for feeding plants, and includes an outlet for dispensing the fluid nourishment, and an inlet which provides aeration....http://www.google.com/patents/US5921443?utm_source=gb-gplus-sharePatent US5921443 - Plant feeder with flow control
