Abstract: A horizontal tray is provided for growing plants and a liquid nutrient reservoir for receiving a predetermined amount of liquid nutrient therein is supported, in counterbalanced fashion, for vertical shifting relative to the tray between an upper position elevated relative to the tray and a lowered position depressed relative to the tray. The support structure supporting the nutrient reservoir in counterbalanced fashion is slightly overbalanced to cause the support means to shift the nutrient reservoir, by gravity, toward the upper position thereof and a flexible drain tube communicates the lower portions of the interiors of the tray and reservoir for draining nutrient from the reservoir into the tray upon movement of the reservoir to the upper position thereof and return drainage of nutrient from the tray into the reservoir upon subsequent movement of the reservoir to the depressed position thereof, structure being provided to releasably retain the reservoir in the depressed position.

Abstract: An upstanding open top reservoir is provided and a foraminated plate is disposed within an upper portion of the reservoir with the latter and the plate including coacting structure supporting the panel or plate within the reservoir against downward displacement relative thereto. An upstanding sleeve is secured through a central portion of the plate and supported therefrom. The upper and lower ends of the sleeve include liquid outlet and liquid inlet structure, respectively, spaced above and below the plate and manually operable lift pump structure is disposed within the sleeve, includes an operator actuatable from the upper end of the sleeve and is operable, upon actuation of the operator, to lift liquid plant nutrient upwardly through the sleeve from the lower end thereof to the upper end thereof for flowing outwardly from the upper end of the sleeve through the liquid outlet structure.