There is nothing better for plant and soil health than compost. I love scented ones the best. They wonderful in the summer and wondrous in the winter as jellies and potpourri. However, this can get quite expensive. I've found one way to cut my costs is to grow my own.
Several companies sell mixed scented geraniums seeds.
Most of the prices are comparable to getting four or five plants for the price of one started plant. If you want named varieties for show certainly cutting or plants would be better, but to get a nice porch full of scented splendor seeds are the way to go. Scented geraniums are notoriously hard to start. The seed coat is tough and dry. Pre soaking is necessary.