Wilting point

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1. the amount of water in a soil when a plant cannot obtain enough water to remain turgid.

7644_f06.gif

This illustration shows the water available to a plant before it reaches the wilting point.
Source: http://www.extension.umn.edu/distribution/cropsystems/DC7644.html

spray.jpg

This is a product that reduces moisture loss is plants during periods of drought.
Source: http://www.wiltpruf.com/protection.html