Roses around the old garage!

love the roses, perhaps you can give me some pointers.I have existing rose bushes which grow well and flower beautifully, but have bought many palnts and kill everyone of them, I have been through 3 knockout roses, which supposedly are a cinch to grow and in weeks they totally just disappear. same thing happened at my mothers house, i bought her one for mothers day last year, nothing happened, put it in the ground and no flowers, no growth, just disappeared,
help!!
stephanie

So beautiful! My Grandad used to grow roses, & had them trailing everywhere in his garden. They're lovely!