A garden is much more than just pretty colored flowers. Plants have texture that makes them not only interesting to look at, but fun to touch. The fuzzy leaves of Lamb's Ears seem to call to be petted. The curling strips of bark on a Paperbark Maple tempt you to peal them off. The alligator hide bark of a flowering Dogwood yearns to be touched.
Gardens are full of sounds too.
The more diverse your garden is the more different kinds of animals and birds you will attract, each creating their own sounds. However, plants make sounds as well. Leaves and the plumes of tall decorative grasses rustling in the wind, seed heads popping open, twigs snapping, all of these sounds are integral parts of the garden experience. The smell of garden is perhaps the best fragrance in the world, as evidenced by the number of perfumes made from flower extracts. Fragrances can trigger so many memories in our mind.