Effects of growth regulators on flowering and growth of Chrysanthemum x morifolium'Butterfield'

Chrysanthemum x morifolium'Butterfield' is a new cultivar hybridized by the Yoder Brothers, Inc. For producing potted flowers, the height must be controlled. Ancymidol(A-Rest)、Daminozide(B-Nine) and Paclobutrazol(Bonzi) were tested. The experiment was done in a randomized complete block-design. Each block contained 7 different treated plants. There were 5 plants in per 7 treatments. All plants except the control (unpinchel) treatment were pinched back 20 days after transplanting . Results show that Daminozide was gave the best results: Plants treat with B-Nine showed a short marketable height of 36.04?cm tall, a desirable canopy area of 631.2?cm~2, more flower buds and flower braches, earlier days to visible flowers, and an desirable overall performance when compared to the other treatments.