Treat your roses to some pepper drinks!
Companion planting is all about knowing the secret, mystifying habits of plants and how they like or dislike growing near each other. And if you make the right choices you will find that your flowers, vegetables, herbs, trees, bushes etc. will all grow well and remain healthy without the use of harmful pesticides.
Growing parsley around roses is a good idea as they like each other and parsley will keep a certain kind of pest away from the rose.
Rue a very bitter herb is a strong insect repellent and will protect the rose against the Japanese beetle when planted around it.
Make this spray of ground pepper pods, onions and a bulb of garlic. Cover this mash with water, let stand for 24 hours and strain. Add enough water to make a gallon of spray. Use several times daily on roses, azaleas, chrysanthemums or beans. Then bury the remaining mash among the plants where the insects appear says Louise Riotte in her book Companion Planting for Successful Gardening.
Interestingly she says that thorny twigs of raspberry, rose, or mesquite, pushed into burrows will scratch the moles and cause them to bleed to death!