Abstract
A summary of biological information is provided on two species of prickly nightshade, Solanum carolinense (horse-nettle) and Solanum rostratum (buffalobur). Horse-nettle, a perennial, is a troublesome weed in southern Ontario. It is also an important host for insects and diseases of crop plants and is considered poisonous to sheep, cattle and humans. Buffalobur, an annual, is widely scattered across Canada, and reported to be poisonous to livestock. Details of reproductive biology, response to insects and methods of control for both species are presented.Key words: Horse-nettle, weed biology, Solanum spp., buffalobur
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