How do deep-rooted phreatophytes obtain water in desert environments?

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map of western North America — North American Desert Physical features of western North America.

In the North American Desert, phreatophytes survive by maintaining access to a permanent water supply located deep underground. Unlike other desert plants that rely on moisture-preserving adaptations or dormancy, phreatophytes utilize very deep root systems to reach and tap into groundwater.12

By extending their roots to these deeper soil layers, these plants are able to remain physiologically active even during extended periods of drought when surface moisture is unavailable. This strategy allows them to sustain themselves in arid environments where other vegetation might otherwise perish.21