The following of last winters crosses that involve my suspected tetraploid rugosa (Sir Thomas Lipton X OP) have grown at least one foot in height this summer (I consider that these are mature enough to survive the winter):
(George Vancouver X John Davis) X (Sir Thomas Lipton X OP). One plant.
(Sir Thomas Lipton X OP) X Simon Fraser. Three plants.
The following seedlings are alive but have grown less than one foot (these may not survive the winter - I have sprayed them with gibberellic acid to give them a boost):
(George Vancouver X John Davis) X (Sir Thomas Lipton X OP). One plant.
(Sir Thomas Lipton X OP) X Simon Fraser. Three plants.
(Sir Thomas Lipton X OP) X OP. One plant.
(Sir Thomas Lipton X OP) X ((Therese Bugnet X OP)X OP). One plant.