The Public Health of Flowers

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Researchers found that 1 mg of Viagra added to a vase of cut flowers will
make the flowers stand up straight, and keep them from wilting for 7-10
days longer than expected. (A usual single dose of Viagra, when used to
treat male impotence, is 50-100mg).  The authors conclude that, apparently,
Viagra is the cure for all that wilts.

(Plant Physiol Biochem1998;36:825-33)