I would like to get nice bushy mums this fall and wonder what kind of fertilizer you all use and how often...I pinch mine back but never seem to be able to get a nice bushy plant........help.......
You can either apply a 20-20-20 water soluble fertilizer once a month through the growing season or a slow-release organic fertilizer like cottonseed meal (with some coffee grounds now and then) or compost. They respond well to organic materials.
You can rejuvenate some of the old shrubs by digging them up, dividing them and replanting them. Consider starting cuttings too (if not patent protected).