The first step is to choose the container. It can be made of any material but the size is the most important. Most bush roses need a space of at least 18 inches for their roots and miniatures need 12 inches. Soil should be a soil based compost or if weight is a problem then a peat based one. The container needs to be raised on bricks to allow free drainage. As a rule the most satisfactory tub roses are small floribundas, landscape or miniatures.