A plant cultivation system (100, 1400), comprising: at least one plant support staircase (120, 1420); each plant support staircase comprising a plurality of distinct individual plant receptacles (122Z, 1422Z, 1221, 14221, 122N, 1422N) including a zenith plant receptacle (122Z, 1422Z) and a nadir plant receptacle (122N, 1422N); each plant receptacle (126, 1426PN, 1426N) comprising a water basin adapted to contain water; the plant receptacles arranged descendingly from the zenith plant receptacle to the nadir plant receptacle; the plant receptacles being horizontally stepped so that each plant receptacle is vertically unobstructed by each ascendingly adjacent plant receptacle; wherein the plant receptacles are configured so that water supplied to a zenith basin cascades down the plant support staircase through descendingly adjacent basins toward a nadir basin (126, 1426N); the plant cultivation system further comprising: an enclosure (102, 1402) defining an interior volume; the enclosure having an access port (106, 1406) opening into the interior volume (104, 1404); a closure (108, 1408) movably coupled to the enclosure, the closure being movable between: a closed position obstructing the access port; and an open position permitting access to the interior volume through the access port; wherein the at least one plant support staircase is disposed within the interior volume; characterized in that: when the closure is in the closed position, the closure cooperates with the enclosure to substantially exclude external light from the interior volume while airflow into and out of the interior volume is permitted; and in that at least one light source disposed within the interior volume and adapted to illuminate the plant receptacles; wherein the at least one light source comprises a respective light set (158, 1458) for each plant receptacle; and each light set is arranged in registration with its respective plant receptacle. at least one plant support staircase (120, 1420); each plant support staircase comprising a plurality of distinct individual plant receptacles (122Z, 1422Z, 1221, 14221, 122N, 1422N) including a zenith plant receptacle (122Z, 1422Z) and a nadir plant receptacle (122N, 1422N); each plant receptacle (126, 1426PN, 1426N) comprising a water basin adapted to contain water; the plant receptacles arranged descendingly from the zenith plant receptacle to the nadir plant receptacle; the plant receptacles being horizontally stepped so that each plant receptacle is vertically unobstructed by each ascendingly adjacent plant receptacle; wherein the plant receptacles are configured so that water supplied to a zenith basin cascades down the plant support staircase through descendingly adjacent basins toward a nadir basin (126, 1426N); the plant cultivation system further comprising: an enclosure (102, 1402) defining an interior volume; the enclosure having an access port (106, 1406) opening into the interior volume (104, 1404); a closure (108, 1408) movably coupled to the enclosure, the closure being movable between: a closed position obstructing the access port; and an open position permitting access to the interior volume through the access port; wherein the at least one plant support staircase is disposed within the interior volume; characterized in that: when the closure is in the closed position, the closure cooperates with the enclosure to substantially exclude external light from the interior volume while airflow into and out of the interior volume is permitted; and in that at least one light source disposed within the interior volume and adapted to illuminate the plant receptacles; wherein the at least one light source comprises a respective light set (158, 1458) for each plant receptacle; and each light set is arranged in registration with its respective plant receptacle. an enclosure (102, 1402) defining an interior volume; the enclosure having an access port (106, 1406) opening into the interior volume (104, 1404); a closure (108, 1408) movably coupled to the enclosure, the closure being movable between: a closed position obstructing the access port; and an open position permitting access to the interior volume through the access port; a closed position obstructing the access port; and an open position permitting access to the interior volume through the access port; wherein the at least one plant support staircase is disposed within the interior volume; characterized in that: when the closure is in the closed position, the closure cooperates with the enclosure to substantially exclude external light from the interior volume while airflow into and out of the interior volume is permitted; and in that at least one light source disposed within the interior volume and adapted to illuminate the plant receptacles; wherein the at least one light source comprises a respective light set (158, 1458) for each plant receptacle; and each light set is arranged in registration with its respective plant receptacle. when the closure is in the closed position, the closure cooperates with the enclosure to substantially exclude external light from the interior volume while airflow into and out of the interior volume is permitted; and in that at least one light source disposed within the interior volume and adapted to illuminate the plant receptacles; wherein the at least one light source comprises a respective light set (158, 1458) for each plant receptacle; and each light set is arranged in registration with its respective plant receptacle.