To help you buy your roses and to try and clarify the way roses are sold:-
Roses are grown as crops in the field and every year one crop becomes ready for sale in November.
During the winter months roses are mostly sold in the traditional 'bare rooted' or 'field grown' way. This is a very good way of buying and planting roses when they are dormant, allowing them to grow away strongly in the spring having settled in over winter. Bare root roses are dug straight out the field and have no soil round their roots and no pots so are cheaper to buy. The plants will always be packed in a way that keeps their roots moist which is very important and they should be planted within a week of receiving them for best results.
We will pot a large proportion of our crop too which then allows us to sell roses when they are actively growing - digging rose plants out the ground at any other time than during their winter dormancy will be certain death for them!