Ecopots having a large number of holes permeable to the culture solution and air are used for disposing seeding and seedling pots or for planting seedlings and are hung in the space in a house, a bucket for collecting the drips of the culture solution is placed below each pot for collecting the residual solution to thereby prevent the infection by pathogens, and a balancing toy-like hanger hung vertically from a hook hung movably from a shelf pole in the house via a loop clutch, an ecopot hanging chain, a main melon stem attracting cord, a melon fruit hanging cord and so forth are used to render the ecopot hung from the ecopot hanging chain orientation-variable in all directions so that oxygen may be fed abundantly to the rooting zone of the horticultural plant and the plant may receive the sunshine with ease.