I have two Queen of Sweden seedlings that I bought last fall, and the seedlings are basically the same. This spring, they were tested to top them, one tree was topped, one was not, and now use the data to illustrate the difference between the two.
On March 26th, one of the trees was topped, let's talk about this one. March to April, the maximum temperature is basically below 22 ° C, the low temperature is sometimes only seven or eight degrees, to the end of April only began to 25 ° C, during the rain is more, fortunately not sick, because the temperature is low, about two weeks or so new shoots to come out, two weeks of appearance of flower buds, has been in the gestational bud stage, to the first two days of flower buds began to color.
At present, the height of the plant is twice that of the top, and the amount of flowers is almost double, and the place where the top is topped has basically grown two buds before and after. Early spring from topping to flowering, almost 45 days.
There is no top of one, the first batch of flowers have ten flowers, from April 18th to open the first flower, successively opened to May 5th, all pruning, early pruning, early pruning, the earliest cut on April 22, now the place of pruning has grown new shoots. Now the temperature is high, and it is estimated that it will be able to bloom again in mid-June.
Summary: If it is a medium and large seedling, you can not top, first look at a wave of spring flowers, spring flowers end, early pruning, it is too late to see another wave before the summer, because the temperature rises at this time, the growth rate is significantly faster than that of early spring, and the early spring top of the month, the temperature is low, the growth is slow, and it takes 45 days to flower after the top. After the flowering is pruned, it is estimated that it will not bloom until the summer, and the appearance of the summer flower will be affected, so you can simply not let it flower and wait until the autumn to bloom again.