STUDY ON INCREASING ROSE SEED GERMINATION

See:

Link: www.actahort.org/books/855/855_26.htm

It is possible that other strains of Bacillus-species plant-growth-promoting rhizobacteria may work.

See:

http://www3.interscience.wiley.com/journal/122474296/abstract

The 2009 review below does not mention faster germination (I have a full copy). It does mention faster growth after germination.

http://arjournals.annualreviews.org/doi/abs/10.1146/annurev.micro.62.081307.162918

Link: www3.interscience.wiley.com/journal/122474296/abstract