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Balancing vegetative growth with fruiting is a primary concern in strawberry (Fragaria ×ananassa Duch.) production. Where nursery plant selection and preconditioning are inadequate for runner control, additional approaches are needed. The gibberellin biosynthesis inhibitor prohexadione-Ca (commercial formulation Apogee) was tested over two seasons for suppressing fall runners of ʻChandlerʼ plug plants in a cold-climate annual hill production system. Prohexadi- one-Ca was applied as a foliar spray at active ingredient concentrations ranging from 60 to 480 mg·L -1 , either as a single application 1 week after planting, or repeated at 3-week intervals. The lowest rate resulted in inadequate runner control, with some runners producing malformed daughter plants. Higher rates resulted in 57% to 93% reductions in fall run- ner numbers, with a concomitant increase in fall branch crown formation. There were no effects of the prohexadione-Ca treatments on plant morphology the following spring, and no adverse effects on fruit characteristics or yield. Chemical names used: prohexadione-calcium, calcium 3-oxido-4-propionyl-5-oxo-3-cyclohexene-carboxylate. The balance between vegetative (branch crowns, stolons) and generative (fl owers, fruit) growth of strawberry is of critical con- cern to plant breeders, propagators, and fruit producers (Darrow, 1929). Cultural practices and systems in the nursery and fruiting fi eld have been devised to promote either vegetative or generative growth, by exploiting components of the seasonal growth cycle. In the annual hill production system, nursery transplants are planted close-spaced and stolons or runners are prevented or removed to promote fruit production on large multi-crown plants (Galletta and Bringhurst, 1989). In this system as practiced in regions of concentrated production, vegetative growth is effectively regulated by environmental conditions in the nursery and fruiting fi eld. These conditions are controlled by selecting nursery location based on

Prohexadione-calcium Decreases Fall Runners and Advances Branch Crowns of `Chandler' Strawberry in a Cold-climate Annual Production System