You can find them hereOoculation locks.
The Rosa canina Pollmeriana Schreiber is particularly suitable for heavy soils and can withstand high temperatures, drought and severe frosts very well. This makes it the first choice for continental climates.
The refinement time is a little earlier here than with other varieties.
The stingless shoots make grafting very pleasant.
In addition, the Rosa canina Pollmeriana Schreiber seldom forms wild shoots.