Answer: The size of the container would depend on they type of rose you are growing. A miniature rose would need a smaller pot than a larger rose would need. A hybrid tea for instance would do well in a half barrel container. A container with some insulating property such as a wooden half barrel is helpful, and many gardeners are finding that the soilless mixes do best in containers. These may also include a water holding polymer as well as some initial fertilizer.
A careful regime of fertilizing and watering is needed to grow roses successfully in containers. You may also find that a drip watering system is helpful in this regard.
Finally, container grown roses usually survive the winter better if moved to a sheltered location or at least given wind protection. The roots should also be insulated as well as possible since they do not benefit from the insulation they would have in the ground.
I am wondering if you have tried any of the rugosa roses, they seem to do quite well in a sandier soil, and are generally very healthy as well.
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