How do deep roots help some desert plants reach water?

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sand dunes — Desert Sand dunes in the Sahara, near Merzouga, Morocco.

In desert ecosystems, some plants survive dry periods by utilizing very deep root systems that reach soil moisture located at significant depths. These specialized plants, often referred to as phreatophytes, are able to obtain water directly from the water table or the layer of soil immediately above it.12

By extending their roots deep into the ground, these plants can access reliable water sources that are unavailable to species with shallower root systems. This adaptation allows them to remain physiologically active even when surface moisture is depleted, providing a critical survival strategy in arid environments where rainfall is infrequent.1