  urlLink BBC NEWS | Scotland | Square trees at HQ turning heads : "The new Scottish Gas headquarters in Edinburgh is cultivating some eye-catching trees - of the square variety. The trees, which have trunks, branches, leaves and are planted in the ground, were designed by Hyland Edgar Driver.
Scottish Gas said the trees were called Tillia Cordata and the technique to make them square is known as 'pleaching' or bracing the trees. Steve Gorry, Scottish Gas' regional head of operations, said 'everyone comments' on the unusual design. The trees were installed by Premier One Land Services, who have won awards for the urban refinement of the landscapes in the capital's Leith area..." 
