The following houseplants are poisonous, some in very small doses: Dumb cane, English ivy, foxglove, hyacinth bulbs (and leaves and flowers in quanti… - Heidi Murkoff

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The following houseplants are poisonous, some in very small doses: Dumb cane, English ivy, foxglove, hyacinth bulbs (and leaves and flowers in quantity), hydrangea, iris rootstalk and rhizome, lily of the valley, philodendron, Jerusalem cherry. Outdoor plants that are poisonous include: Azalea, rhododendron, caladium, daffodil and narcissus bulbs, daphne, English ivy, foxglove, hyacinth bulbs (and leaves and flowers in quantity), hydrangea, iris rootstalk and rhizome, Japanese yew seeds and leaves, larkspur, laurel, lily of the valley, morning glory seeds, oleander, privet, rhubarb leaves, sweet peas (especially the “peas,” which are the seeds), tomato plant leaves, wisteria pods and seeds, yews. Holiday favorites holly and mistletoe, and to a lesser extent, poinsettia (which is irritating but not poisonous), are also on the danger list.