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Water Is Your Business Plan: Costing Irrigation for a Commercial Karoo Grow
Every Karoo farmer knows the truth city investors learn the hard way: out here, water is the business plan. Cannabis is a thirsty crop at peak flower, and the difference between a profitable commercial season and a write-off on the plateau usually comes down to hydrology, not horticulture.
Before you commit to a commercial planting in this terroir, put real numbers on these:
Borehole yield and quality. A sustained test (not a one-hour spot check) tells you your true litres-per-hour through a February heatwave. Test for salinity too — Karoo groundwater varies enormously, and cannabis tolerance has limits that show up as locked-out nutrients late in flower.
Storage as insurance. Rain falls in the Karoo in violent, occasional bursts. Every cubic metre of storage you build converts an unreliable gift into a reliable input. Most successful dryland-adjacent operations here run 30-60 days of full-demand storage.
Drip, always. Overhead irrigation in this evaporation zone donates half your water to the sky. Pressure-compensated drip under mulch cuts consumption 40-60% and keeps humidity off the canopy — which in this dry air is your natural mould insurance, one of the Karoo's genuine commercial advantages.
The upside nobody prices in: high-altitude light intensity, massive diurnal temperature swings, and dry autumn air produce dense, resinous flower with terpene profiles that humid coastal grows cannot copy. Water discipline is the entry fee for one of the best cannabis terroirs in the country.
Anyone here running commercial or semi-commercial irrigation numbers in an arid zone? Share your litres-per-plant-per-day at peak flower — building a Karoo benchmark thread would be gold for the growers coming after us.