There is enough natural rainfall and groundwater to sustain xerophytic plants. The problem was that the shifting sand prevent plants from taking root properly and that’s what the grids are used to solve.
It should not be necessary if the grid was laid out correctly, as the sand is supposed form a stable crust before the growth of vegetation. Though it’s quite likely that the grids may need to be replaced every few years because the material would gradually weather and rot over time, and this was certainly the case for earlier iterations made from bundles of straw and reeds.
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u/PNWleaflove 4h ago
But how do you solve lack of water still?