Abstract: Disclosed are high-density soil-less hydroponic cultivation systems, apparatus used therein, and methods of operation thereof. A high-density soil-less cultivation system can comprise one or more grow columns, each comprising a column lumen, and one or more angled housings coupled to the grow columns. The system can further comprise a nutrient reservoir configured to contain a nutrient solution to be delivered to the grow columns, a capture conduit coupled to the grow columns configured to capture or recapture nutrient solution flowing through the grow columns, and a capture reservoir configured to collect the captured or recaptured nutrient solution from the capture conduit for delivery to the nutrient reservoir to be reused. The system can also comprise an omnidirectional light tower configured to shine light on the one or more angled housings to induce growth of any plant matter within the angled housings.