A. Miniature roses planted in containers require the same care as all roses. Just remember that container-grown plants require more care than the same plant in the ground.
Choose a 6 to 8 inch clay pot which has been soaked in water for 30 minutes. Place pieces of broken pottery over the drainage hole. You are now ready to pot with your favorite ready-mixed soil. Whether you are planting a miniature in a container or in the ground, set it slightly deeper than it originally grew. Water thoroughly.
Although roses thrive on sun, they need a moist medium for their roots. Adding mulch after potting will help keep the plant from drying out so quickly. Even so, you may have to water several times a day. This frequent watering leeches soluble nutrients from the soil. Liquid fertilizers are simple to apply, available immediately to the plant and the safest to use in containers. Fertilize every two weeks after growth begins.
Another important need for roses is a regular spraying schedule for pest and disease. Every two weeks either spray or dust with a multi-purpose pesticide. There are also systemic pesticides, either liquid or granules, which can be applied every six weeks. Keep in mind that a strong blast from the garden hose every other morning can help control many pests.
Miniatures do not need heavy pruning. Most often, light shaping is all that is needed. For additional help consult Ortho's "All About Roses", which has the American Rose Society endorsement.