Raphanus sativus - sow outdoors, germination in less than two weeks at 50F,
Ratibida columnifera - use 9 weeks at 39F, move to 80F for germinationnation.
Ratibida pinnata - use 9 weeks at 39F, move to 80F for germination.
Reseda odorata - germination in less than two weeks at 68F,
Rheum australe - Very lightly cover seeds and use F 70, germination in 2 to 4 weeks.
Rheum palmatum 'Atrosanguineum' - Very lightly cover seeds and use F 70, germination in 2 to 4 weeks.
Rheum palmatum V. tanguticum - Very lightly cover seeds and use F 70, germination in 2 to 4 weeks.
Rheum palmatum - Germination in 2weeks at 68F.
Rhodochiton atrosanguineum - Germination over many weeks at 60F, slow germination that is spread out over a few months..
Rhus chinensis - nick and soak, 3-4 weeks at 68F . Surface sow seeds, light needed for best results., if no germination., 2-4 weeks at 39F, then 68F
Rhus typhina - nick and soak, 3-4 weeks at 68F . Surface sow seeds, light needed for best results., if no germination., 2-4 weeks at 39F, then 68F
Rhus typhina 'laciniata' - nick and soak, 3-4 weeks at 68F . Surface sow seeds, light needed for best results., if no germination., 2-4 weeks at 39F, then 68F
Rhynchosia phaseoloides - nick coat, germination in less than two weeks at 77F,
Ricinus communis 'carmencita' - soak seed, germination in less than two weeks at 60F,
Rosa blanda - Put seeds is a plastic baggy with moist seed mix and put in fridge for 120 days. Remove and sow at 65-70F.
Rose "Angel Wings' - Sow seeds into a bag with some moist seed medium and put in the fridge for 3 weeks, So and use F 65. germination in 2-6 weeks.
Rosmarinus officinalis - germination in less than two weeks at 68F . Surface sow seeds, light needed for best results.,