Please help! I know nothing about roses, but am renting a house with a yard full of them! I have a mammoth rose bush that is huge and out of control. The flowers are dying and ugly, but Cutting the way the online sites recommend will not even make a dent into this thing. There are long thick branches with no grow and then leaves and roses at the end. I can look inside the beast and see new roses and new growth underneath theses branches. I want to just cut the whole thing down to this new growth, but I don't even know if I can do that. I tried trimming and have made an ugly hole in the thing. I'm at a loss. I am adding a picture of what it looked like in March- It's grown much larger and half the roses are dead now. The 2nd picture is close up of what the blooms look like. Thanks for any help!!!