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The new study, focused on Carpobrotus, Acacia, Agave, and Opuntia, reveals the sophisticated strategies of invasive plants to occupy new habitats successfully and move the native flora.

"The case of the Opuntia genus is also very evident along the coastline of the Alt Empordà and southern France, among many other places with fragmented habitats, which are the areas most susceptible to colonization by invasive plants," stresses the author, member of the Department of Evolutionary Biology, Ecology and Environmental Sciences.

The event will include displays of many rare and unusual succulents, including aloe, echeveria, euphorbia, agave, opuntia, pachypodium and ferocactus.

Known scientifically as Opuntia littoralis, coastal prickly pears are native to Southern California and crucial to the ecosystem, according to John Trager, curator of desert collections at the Huntington Library, Art Museum and Botanical Gardens in San Marino.

Some good choices for indoors: Opuntia subulata, Cereus peruvianus, Cereus jamacaru, Aporocactus flagelliformis, Notocatus concinnus and Notocactus ottonis.