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This research has direct implications for public and private institutions seeking to conserve water by irrigating landscapes with recycled (a.k.a. reclaimed) water. Although typical salt contents in recycled water are low (< 2.0 dS m−1), levels may still be harmful to salt-sensitive plants. We discovered that salt accumulation in soils would negatively impact coast redwoods when recycled water salinity exceeds>1.0 dS m−1. This is the first paper reporting the impacts of salinity on the growth of the coast redwood. The results suggest that irrigation management of long-lived conifers will be essential to protect these important trees.

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