In the assemblies of the enlightened ones there have been many cases of mastering the Way bringing forth the heart of plants and trees; this is what awakening the mind for enlightenment is like. The fifth patriarch of Zen was once a pine-planting wayfarer; Rinzai worked on planting cedars and pines on Mount Obaku. . . . Working with plants, trees, fences and walls, if they practice sincerely they will attain enlightenment.
DogenSince we are provided with both a body and a mind, we grasp onto the physical forms we see. Since we are provided with both a body and a mind, we cling to the sounds we hear. As a consequence, we make ourselves inseparable from all things, yet we are not like some shadowy figure 'lodging' in a mirror or like the moon in water. Whenever we witness what is on the one side, its opposite side will be in darkness.
Dogen