Very soon stocks of new season's roses will be arriving in the garden centres, if they're not already there. Indeed, to be sure of getting the most sought after varieties it may have been necessary to put an order in some time ago. However, in their rush for the new, those who are slaves to fashion often overlook gems, leaving some of the best tried and true plants for those prepared to simply wait and see what is available. Gallica roses are a case in point. While the popularity of Old Roses wa.