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How about a picture of the plants, Bill? We also need to know your location in the world, to advise you. Please fill in your personal profile to include your city/state/country so we'll know a bit more about your climate. (just a zone doesn't help)
Off the top of my head, those perennial cranesbill geraniums bloom year after year but they need some sun, and drying out between waterings. Overwatering and too much fertilizer can cause lush foliage and no flowers but the sun is what will bump them into flowering a lot. If they are shaded by trees or something, can you cut back a branch or two, to let them see more sun?