An improved soilless media composition including (a) green tuff; and (b) a substrate such as peat or bark. A method of enhancing the growth of plants including adding plant propagative material to a soilless media composition comprising (a) green tuff; and (b) a substrate.

A growing chamber adapted to grow at least a portion of a plurality of plants therein, an inlet duct leading into the growing chamber, an outlet duct leading out from the growing chamber, the growing chamber being sealed from its surroundings except for the inlet and the outlet. A method of growing at least a portion of the plants in the growing chamber, can include: raising the relative humidity level in the growing chamber to at least 45%, lowering the relative humidity level in the growing chamber to below 45%, and repeating the steps of raising and lowering at least five times during a single day.

A growing chamber adapted to grow at least a portion of a plurality of plants therein, an inlet duct leading into the growing chamber, an outlet duct leading out from the growing chamber, the growing chamber being sealed from its surroundings except for the inlet and the outlet. A method of growing at least a portion of the plants in the growing chamber, can include: raising the relative humidity level in the growing chamber to at least 45%, lowering the relative humidity level in the growing chamber to below 45%, and repeating the steps of raising and lowering at least five times during a single day.

A method of growing plants in which the plants extend in a growing chamber can include emitting light from a light source onto a foliage of the plants, the light source being positioned within a light source conduit having an inlet and an outlet, and the emitted light being transmitted across a transparent wall of the light source conduit to the plants, circulating air in the light source conduit, the air circulating in the light source conduit absorbing heat from the light source, and transferring at least some of the heated air obtained from the outlet of the conduit to the growing chamber, thereby conditioning the temperature in the growing chamber. Other methods of handling the air medium are also presented.

A plant growth media composition, articles made therefrom, and methods of making and using the same are described. The plant growth media composition includes a combination of one or more plant growth substrate materials and an additive such as cellulose fibers, clay, carrageenan, alginate, chitosan, or combinations thereof.

A porous glass plant growth support structure, including a porous glass substrate and a plurality of interconnected pores distributed throughout the substrate. The substrate is typically formed from foamed glass and/or fused glass spheres and is characterized by a porosity of at least about 80 percent. The pore size is substantially between about 0.2 and about 5 millimeters and the substrate is sufficiently chemically stable such that water filling the plurality of interconnected pores experiences a pH shift of less than 0.5.

A dual-media horticultural plug comprising a base having a substantially continuous bottom surface and a top surface spaced from the bottom surface, a sidewall extending from the base and forming an elongated inner cavity, a growing substrate substantially filling the elongated inner cavity, and a water-impermeable outer cover substantially covering an open top end of the elongated inner cavity. The growing substrate comprises a first growing medium having a first water holding capacity, and at least one of the base and the sidewall comprise a second growing medium having a second water holding capacity. The first water holding capacity is greater than the second water holding capacity.

A porous glass plant growth support structure, including a porous glass substrate and a plurality of interconnected pores distributed throughout the substrate. The substrate is typically formed from foamed glass and/or fused glass spheres and is characterized by a porosity of at least about 80 percent. The pore size is substantially between about 0.2 and about 5 millimeters and the substrate is sufficiently chemically stable such that water filling the plurality of interconnected pores experiences a pH shift of less than 0.5.

A pot system and apparatus comprises an outer shell, an inner vented container configured to fit inside the outer shell, the inner vented container further comprising: a top lip, an upper basket, and a soil chamber, the pot system being configured to prevent root rot, provide air pruning, and to foster bacterial growth and air circulation to passively scrub indoor air.

A pot system and apparatus comprises an outer shell, an inner vented container configured to fit inside the outer shell, the inner vented container further comprising: a top lip, an upper basket, and a soil chamber, the pot system being configured to prevent root rot, provide air pruning, and to foster bacterial growth and air circulation to passively scrub indoor air.