looks like an unpromising site for a vineyard in Valle do la Geria
in Lanzarote in the Canary Islands. The farmers dig holes in the volcanic
soil and fill them with volcanic ash. A smaller hole is dug in the
centre of the pit for the roots of a vine. The vine relies on the
moisture retained by the porous ash from night time humidity and morning
dews. Crescent shaped stone walls called zocos are built to shelter
the plant from the northern prevailing winds.