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Crabapples offer a wide variety of tree forms and size, leaf shapes, flowers and colourful fruits which improve the quality of green spaces, being an excellent four-season landscape trees. The aim of this study was to determine flower development of Malus x zumi 'Professor Sprenger' using Biologische Bundesantalt, Bundessortenamt, and Chemische Industrie - BBCH code under urban conditions. Observations were made weekly during two growing seasons to identify the flowering stages. Flowerdoi:10.15835/buasvmcn-hort:0041 fatcat:mvdkgjtrqjffncisb3gyr3ezca