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Orchard Hills’ zone is filled with prickly pear cacti, Japanese honeysuckle and Formosa firethorn.

One 17th-century plant now growing there called the firethorn — which leaves a delightful citrus smell on the fingers when rubbed — is prized and feared because it literally catches on fire with the slightest heat.

Pyracantha, also known as "firethorn," European holly, which has very sharp leaves, and voodoo rose.