A garden is to be enjoyed, and should satisfy the mind and not only the eye of the beholder. Sounds such as the rustle of bamboo and the dripping of water, scents and sensations such as grass or gravel or stone underfoot, appeal to the emotions and play a part in the total impression.
You've got to know your limitations. I don't know what your limitations are. I found out what mine were when I was twelve. I found out that there weren't too many limitations, if I did it my way.