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May4-08, 11:44 PM
In the case of the nightshade, I wonder if it is poisonous to all critters or just some of us. Why would a plant make a tempting poisonous fruit? Sooner or later animals will learn to spot the deception and then the seeds won't be spread in the customary fasion. Right?
Nightshade spreads through rhizomes as well as seed. It's almost impossible to kill off.