Just at the edge of the true deserts are places that get a bit more rainfall. This extra water allows these semi-arid zones to support much greater plant biodiversity. In fact, some of these semi-arid zones contain more plant species than anywhere else outside of the tropics. Places like the region around Cape Town, South Africa, or in the southwestern corner of Australia. The plants here are often scrubby and can look very similar, but when they bloom, all of the biodiversity they contain is on full display. We have species from a number of semi-arid places around the world in our collection happily coming.