Softening boulder walls

In this area boulders are being relied on too heavily by landscapers and homeowners. They end up looking sterile and overwhelming. Here is an example of how to soften them. In the attached photo mossrose was used. It is an annual in the upper midwest that requires very little soil, can withstand sun and heat, and needs minimal watering if any. Another option is to use creeping sedum. They too require only a handfull of soil stuffed in to a crevice, watering only when first planted and will withstand sun and heat. Another option is to use fewer boulders and more native plantings. Instead of massive amounts of boulders, try a few boulder outcroppings combined with some native grasses.