5 ~ 7mg / L. Rose fragrance pull spike concentration is to be based on the rose fragrance varieties, the most commonly used is erythromycin, spike length of about 10cm, basically the use of time in about 10 days, the concentration of 5 ~ 7mg / L. Rose fragrance is a variety of grapes, is a medium-late ripening varieties, originating in the United Kingdom, it is a medium growth of the plant, the second fruiting rate of the high, abundant yield.