For a good joint, a fluted or spiraled dowel must fit snugly enough in the hole to allow the glue to come up around it. The dowel should reach to the bottom of the hole and be used with enough glue. For insurance, apply glue to both the sides of the hole and to the dowel itself.
Regular fertilizer applications are necessary for good perennial growth. Apply 5-10-5 fertilizer in a ring around each perennial in the spring just as growth starts. Make two additional applications at six week intervals. Late bloomers such as chrysanthemum need an additional application in late summer. Always water the perennial bed after fertilizing.