If you want to plant new roses where roses have previously been growing , the it is advisable to change the soil . This can be done by taking soil from somewhere in the garden that roses haven;t been grown before , or buying sterilised top soil and using this to grow new roses . If you don;t do this you run the risk of getting what is known as rose sickness and the roses don;t do very well .So my advise is definitely change the soil for the best possible results.
