Herbal Herbicides

Weed killers manufactured by Mother Nature

By Janet Raloff, 15:56 PM April 15, 2008

Certain plants are picky about the company they keep. Once established, walnuts and some sandy shrubs, for instance, create a virtually barren border of ground around them. Many other plants aren't quite so antisocial. They permit numerous species into their neighborhoods, while barring a few plant types.

Chemical defenses play a major role in determining which plants flourish in woodlands, meadows, farms—or even in suburban lawns. Although this herbal warfare has been recognized since Biblic...

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