I have a pink dogwood that was planted in my house two years ago in mid summer, which was probably the wrong time to plant anything but the landscaper said it would be OK. Needless to say this Spring I had to cut several dead branches and it had a few blooms but it doesn't seem to be growing very well. Could you please advise as to how I should fertilize it and when? I would like to keep it. Pink dogwoods are among my favorite flowers. Thank you.