Plant Poisoning By Gerald F O'Malley, DO, Grand Strand Regional Medical Center; Rika O'Malley, MD, Grand Strand Medical Center Reviewed / Revised Jun 2022 | Modified Sep 2022 View Patient Education Topic Resources Moderately Poisonous Plants A few commonly grown plants are highly poisonous, and many plants are moderately poisonous (see table Moderately Poisonous Plants).