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Toxicity. The seeds and pods of wisteria are potentially extremely dangerous to your pooch, as they can be to people. The seeds and pods have toxic lectins, found in most types of beans.Lectins are toxic because they clump erythrocytes.isteria's pink, purple or white blooms produce highly toxic seeds. Medioimages/Photodisc/Photodisc/Getty Images. Wisterias (Wisteria spp.) grow in U.S. Department of Agriculture plant hardiness zones 4 through 9, depending on species and are favored by their fragrant, colorful blooms and climbing ability.
Giant hogweed (Heracleum mantegazzianum) has the worst reputation for it, but âfriendlyâ plants such as carrots, celery and limes can all blister the skin in the wrong conditions. One of the worst untouchable species, whatever the weather, earns the dubious honour of being the worldâs most dangerous tree.Thereâs a difference between poisonous and harmful. You can say whatâs the most poisonous plant fairly easily â theoretically looking at the toxins in it and what they can do,â says John Robertson.