Effects of Pruning Time and Height on Delayed Flowering of Platycodon grandiflorum

In order to regulate the flowering period of Platycodon grandi florum,two-year-old purple flower P.grandiflorum was used as experimental material to study the effects of pruning period and height on delayed flowering of P.grandiflorum.The results showed that after pruning at the final flowering stage,the P.grandi florum no longer blooms.After pruning at other stages,the flowering period of P.grandiflorum was prolonged,and after pruning at the peak flowering stage,the flowering period was prolonged by up to 36days;P.grandiflorum was no longer flowering after pruning at the end flowering stage,while the other pruning period prolonged,ornamental days and the most extended days observed at pruning of florescence stage,reaching 36 days;The total flowering period of pruning at pre-bud stage and bud stage was the longest,which was 41 days;flowering for pruning height of 1/4 was first and flowering for pruning height of 1/2 was relatively late under the same pruning period.The pedicel length of pruning at pre-bud stage was significantly higher than that of control,the total number of flowers of pruning was smaller than that of control,the corolla diameter and petal length of pruning at bud,initial flowering and florescence stage were significantly higher than those of control,the petal width of pruning at initial flowering and florescence stage was significantly higher than that of control and there was no significant difference in floral traits between different pruning heights under the same pruning period.Compared to the pruning height,the pruning period is more conducive to extending the flowering period and increasing the size of the flowers.