I don;t make it grow, and I can tell you it is not very old and it has grown like mad, the thing is the gardener who I have had to have as I can't cut it myself seems to think all he needs to do is cut the grass, so I am going to phone him and ask for him to come and do that one for me, as I am not too sure if he said last week that he won't need to come until nearly spring!..