We did that with pyracantha but have had to nurse it along this year as its not looking great. Would have to wonder if, what to me is forcing the growth, is such a good idea after all. We have pyracantha elsewhere in the back garden (for security) and it grew no problem unlike the already grown stuff.
Get used to landscapers when it is fully grown knocking on your door to cut the hedge even this time of year when it is against the law.
P.S. I know nothing about gardening and hate it because it is so hard on the back