We have a standard rose tree that is quite poorly, dead wood at the bottom and black spot. We thought we'd get rid of it and buy a new one. Can we plant a new one in the same place?
Yes, but before you do make sure you have removed all roots from the diseased rose and any leaves that may have fallen into the soil and they will carry the spores.
Dig in loads of new fresh manure, and once planted give it and all your existing plants and nice new layer of mulch, as this will stop the plants becoming water logged and help stop the disease spreading should it come back.
The problem with planting a rose where a rose has been before is "rose sickness"; there is a very high failure rate of the new rose surviving. Having had several failures we came across this:
They say You should never plant a rose where a rose has been before but according to the experts at the garden centre where I worked for 4 years if you use this it will be ok.
No I wouldn't, masma....as the others have said, it's advised to remove all the soil from the area....I've tried this and the results are never really good.