The Californian border contains some good specimens of varieties of ceanothus with their splendid blue flowers. These are joined by other Californian plants and backed by a protective belt of trees such as Alnus cordata and a variety of eucalyptus to the
northern edge.

 
The Desert Wash is designed to resemble parts of Arizona where it probably only rains once or twice a year, but when it does rain it floods and great rushes of water channel through the landscape tossing rocks and stones asunder leaving behind dry channels and islands where succulent plants flourish. The real work in making a garden such as this starts some one metre below the surface where we break up the sub-soil and incorporate lots of gravel. Then we build layer upon layer of gravel and gravel mixed with soil, the aim being to keep this area very free draining especially during the winter. Many of the plants grown here are able to tolerate some cold provided they remain dry at the root. Some four hundred tonnes of flint of various sizes have been used in the construction of this area so far and the work is still ongoing with improvements and additional
experimental planting.
 
The plants that are growing here are agaves, aloes, puyas, beschonaria, dasylirion, various cacti and other related plants. We are always experimenting and pushing the boundaries.



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