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I'm going to experiment with a fall crop of Japanese radishes and parsnips among my roses. I'll let them get frost killed. I'm hoping the deep roots will help loosen the clay and add humus to the soil as they decay, and that a complex, biologically active soil will help deter pests, especially the rose rosette disease mite, common in my area.
I'm also going to sow leaf lettuce, which also has deep roots, and let the plants decay into the soil after they are frost killed. I'm encouraging wild native strawberries spread on the ground under the roses, and also have planted steeplebush, another rose family plant. My hypothesis is that they attract useful predator insects.