I have done a large number of crosses with Rosa Kiftsgate Filipes this season. I was wondering if anyone had used Filipes before and how long they needed to be stratified for?
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I have no experience with R. filipes (or its most common cultivar), but two to three (or a bit more) months of stratification has been typical for me with most roses of similar background. Most Synstylae usually tend toward the low end of “normal” in that regard. They also usually seem to have a fairly uniform germination curve, with few (if any) seeds continuing to germinate long after the main burst, as can happen with so many other roses.
Stefan
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Thank you for your reply, here’s hoping!