Posted: 19/04/2012 at 13:56
I think it does. Something to do with rival mycorrhizal organisms in the soil that develop as the rose develops and they reach an uneasy balance. If you remove the rose and weaken its root system then when you replant it the soil organisms are too strong for it.
I may not have got that quite right, but in any case it does not matter, as there is a product licenced by the RHS that you sprinkle onto the rose roots. It contains friendly mycorrhizal organisms that enable it to stand up to the soil organisms until the rose has developed its own defences. It's called Rootgrow: