Acknowledgments Many individuals and organizations contributed to the successful completion of the University of California Cooperative Extensions Plant Safely in Drought-Tolerant Landscapes Program. The efforts of those noted below are especially appreciated.
Scientific Name: Achillea millefolium Common Name: Yarrow Thorns/Spines? How is this plant unsafe? How do you plant safely? No In rare cases, yarrow can cause severe allergic skin rashes; prolonged exposure can increase the skin's photosensitivity.
Scientific Name: Agapanthus spp. Common Name: African Lily, Lily of the Nile Thorns/Spines? How is this plant unsafe? How do you plant safely? No Agapanthus lilies are of minimal toxicity to animals unless eaten in large quantities.
Scientific Name: Agave spp. Common Name: Agave Thorns/Spines? How is this plant unsafe? How do you plant safely? Yes Leaves contain toxic sap and many species have spines.
Scientific Name: Aesculus X carnea Common Name: Red Horsechestnut Tree Thorns/Spines? How is this plant unsafe? How do you plant safely? No Seeds of all species are poisonous if ingested and can cause severe pain. Supervise pets and children when playing near this plant.
Scientific Name: Mirabilis jalapa Common Name: Four-o'clock, Marvel of Peru Thorns/Spines? How is this plant unsafe? How do you plant safely? No Seeds and roots are poisonous if ingested Supervise pets and children playing near this plant.
Scientific Name: Myoporum laetum Common Name: Myoporum, Ngaio Tree Thorns/Spines? How is this plant unsafe? How do you plant safely? No Leaves and fruits are toxic if ingested. Invasive in California's wildlands, for more information visit: https://wric.ucdavis.
Scientific Name: Nerium oleander Common Name: Oleander Thorns/Spines? How is this plant unsafe? How do you plant safely? No All parts are poisonous if ingested. Discard prunings and dead leaves, and keep away from animal feed. Supervise pets and children playing near this plant.
Scientific Name: Opuntia spp. Common Name: Cactus, Prickly Pear, Cholla, Indian Fig Thorns/Spines? How is this plant unsafe? How do you plant safely? Yes Problematic because of their obvious spines.
