A growing medium comprising fibrous tree bark and fibrous wood components, wherein the fibers of the growing medium have an average length to width ratio, such that the growing medium has a dry bulk density of about 60 kg/m.sup.3 or lower and wet bulk density of about 120 kg/m.sup.3 or lower.

A method for making a growing medium includes a step of combining tree bark and/or wood components together to form an initial composition; heating the initial composition to a temperature greater than about 149? C. under steam in a pressurized vessel; processing the initial composition through a refiner with a plurality of opposing disks to obtain the fibrous growing medium, the refiner separating fibers from each other; wherein the growing medium has total porosity of 88 volume % or more.

A method for making a growing medium includes a step of combining tree bark and/or wood components together to form an initial composition; heating the initial composition to a temperature greater than about 149? C. under steam in a pressurized vessel; processing the initial composition through a refiner with a plurality of opposing disks to obtain the fibrous growing medium, the refiner separating fibers from each other; wherein the growing medium has total porosity of 88 volume % or more.

A growing medium comprising fibrous tree bark and fibrous wood components, wherein the fibers of the growing medium have an average length to width ratio, such that the growing medium has a dry bulk density of about 60 kg/m.sup.3 or lower and wet bulk density of about 120 kg/m.sup.3 or lower.

A method for making a growing medium includes a step of combining tree bark and/or wood components together to form an initial composition; heating the initial composition to a temperature greater than about 149? C. under steam in a pressurized vessel; processing the initial composition through a refiner with a plurality of opposing disks to obtain the fibrous growing medium, the refiner separating fibers from each other; wherein the growing medium has total porosity of 88 volume % or more.

A method for making a growing medium includes a step of combining tree bark and/or wood components together to form an initial composition; heating the initial composition to a temperature greater than about 149? C. under steam in a pressurized vessel; processing the initial composition through a refiner with a plurality of opposing disks to obtain the fibrous growing medium, the refiner separating fibers from each other; wherein the growing medium has total porosity of 88 volume % or more.

A horticultural substrate conditioner includes a housing having an opening to receive a growing medium and an outlet to discharge the growing medium, a shaft arranged within the housing, the shaft rotatable relative to the housing, and a plurality of tines disposed on the shaft spaced apart from each other, the tines comprising a flexible material, wherein upon entry of a growing medium into the housing, the tines are capable of engaging the growing medium such that as the shaft rotates, the growing medium is broken apart and/or reduced in density and size to enable optimal distribution of the growing medium into a container upon discharge from the housing.

A horticultural substrate conditioner includes a housing having an opening to receive a growing medium and an outlet to discharge the growing medium, a shaft arranged within the housing, the shaft rotatable relative to the housing, and a plurality of tines disposed on the shaft spaced apart from each other, the tines comprising a flexible material, wherein upon entry of a growing medium into the housing, the tines are capable of engaging the growing medium such that as the shaft rotates, the growing medium is broken apart and/or reduced in density and size to enable optimal distribution of the growing medium into a container upon discharge from the housing.

Described is a hydroponic system wherein a feed formulation comprising a plant's nutritionally required mineral nutrients is applied to the foliage of the plant and the roots of the plant are in contact with an incomplete water solution that may comprise only hydrogen and oxygen. The feed formulation, methods of feeding a plant or plant seed, and plants produced thereby are also described.

A growing medium comprising fibrous tree bark and fibrous wood components, wherein the fibers of the growing medium have an average length to width ratio, such that the growing medium has a dry bulk density of about 60 kg/m.sup.3 or lower and wet bulk density of about 120 kg/m.sup.3 or lower.