Here is a list of plants that can be toxic to people and animals. Some people can be allergic to any herb so do your research. These toxic herbs should never be burnt as incense, never be rubbed on the skin, never be ingested and never be inhaled. This list does not include all the potentially toxic herbs.
The amount of poison in a plant tends to vary with location, age of plant, season, weather conditions. In some plants, the toxin is confined only to certain parts. Additionally, plants normally considered non-toxic may have been treated with an insecticide, making them toxic.
Asparagus Fern, Autumn Crocus, Azaleas
Blue Gum, Bleeding Heart, Bunny Ears Cactus, Black Locust, Buckthorn, Buttercups
Chapparal, Comfrey, Caladium, Century Plant, Crown Of Thorns, Cyclamen, Cape Ivy, Calla Lily, Carnation, Castor Oil Plant, Chinese or Japanese Lantern, Chrysanthemum, Clematis, Crocus, Cherry Laurel, Castor Bean
Dieffenbachia, Devil's Ivy, Daffodil, Delphineum, Daphne, Dutchman's Breeches
English Ivy, Elephant's Ear, Elderberry
Fiddle Leaf, Foxglove
Germander, Gladiola, Golden Chain
Henbane, Hellebore, Holly, Horse Chestnut, Hydrangea, Hyacinth
Iris
Jerusalem Cherry, Jonquil, Jack-in-the-Pulpit
Kombucha
Lobelia, Lily of the Valley, Laburnum, Larkspur
Magnolia, Mistletoe, Morning Glory
Narcissus
Ornamental Pepper, Oleander
Pansy, Peony, Primrose, Privet, Poinsettia
Rats Tail Cactus
Silver Vine, Split Leaf, Sweetheart Vine, Sweet Pea, Sweet William
Umbrella Plant
Virginia Creeper
Willow Bark, Wormwood
Yew, Yohimbe