The plants listed on this page are poisonous. We've created this special index as a
public service to perennial gardeners around the world. We do not want to sound
alarmist, but the fact is, many ornamental plants are poisonous to some extent.
Toronto gardens contain at least some toxic or poisonous plants. Some of the most
popular ornamentals are toxic, including shrubs like Rhododendrons and Hydrangeas,
trees like Horse-chestnut and Holly, house plants such as Dieffenbachia and Croton,
and other perennials and annuals as well.