Just a comment, I was a landscape gardener down here in Cornwall for 30 yrs, we as a service to our customers, did all the designing of the jobs ourselves and unless they wanted plans drawn, for which we charged a very nominal sum, we never ever charged for the design. We saw this part of the job as the reason people employed us, for our expertise!! Its always amazed me how much people will pay just for the design alone?? often ,nearly as much as having the actual work done itself.
We have a college locally churning out all these so called 'garden designers', who think all they have to do to is swan around in a straw hat, gesticulate and wax lyrical to earn a fortune.