Top ten most poisonous plants Published May 23, 2020 at 750 × 750 in Top 10 most poisonous plants to cats Top ten most poisonous plants. Image: PoC. Source of general poisons: Cat Owner’s Home Veterinary Handbook (ASPCA). Source poisonous plants: Pet Poisons Helpline + other sites. Continue reading → Please comment here using either Facebook or WordPress (when available).