I am bidding on a commercial account, that has rose bushes. I have never dealt with rose bushes, in the bid packet it states they want them trimmed back and fertilized once a year. I am in northeast OK. and the contract date will be from March 1 - October 31. When would be the best time to trim and fertilize? It looks like in the past they have just been trimmed back to the stump, is this the correct way or not?