Roses go dormant during the winter - or in India during the heat of the summer. During dormancy, their rate of metabolism is low enough that they can be taken out of the ground and shipped without any soil around their roots. Such plants are bare-root plants. They can only be shipped when the conditions for doing so are appropriate. When bare root plants have been field grown, they often have very well developed root systems which help them grow well in their new homes, but being removed from the ground invariably shears off most of the finest feeder roots. They always have the advantage that they are smaller and lighter to ship, but only in January, February, and March.