31 May '13, 6pm

Plants sweat, and it’s beautiful

Plants sweat, and it’s beautiful

Guttation happens when plants take in excess water from the soil, but don’t evaporate it through their stomata (or pores) because those close up at night. (Technically this evaporation, called transpiration, is more analogous to how people sweat — but it’s not as photogenic.) Water pressure in the roots forces some of the plant’s sap out through openings in the leaf edge or tip, so that it looks like the leaf is wearing a tiara.

Full article: http://grist.org/list/plants-sweat-and-its-beautiful/

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