On page 10 of the Autumn newsletter (click on the Public documents tab at the top of this page) you will have read an article about argan trees (argania spinosa) - endemic to Morocco. These can grow to 8-10 metres, but you can see a small one in the temperate glasshouse in the Garden.

The Wikipedia article about argan trees shows a photograph of goats climbing in the trees and eating the foliage - not a problem we are likely to have in the glasshouse I hope!