Everything Else . But a random seed from a Peace rose or any hybrid would be unlikely to produce a plant like the one it came from. For many other roses, however, the seeds must be refrigerated for about four weeks at about 40 degrees, for what gardeners call stratification, a cold period, and again for about four months, at a somewhat higher temperature, for germination, with a light on in the refrigerator. They can be nurtured in moist peat moss. Before sprouting, seeds can be tested for viability by seeing if they float in water.
Floaters are hollow and unlikely to germinate.
The sprouts from the refrigerated seeds can be planted, preferably in sterile soil, perhaps with a cut-off plastic bottle as a greenhouse. If they survive, they may produce miniature roses in just a couple of months, previews of the color of mature roses, but not their shape. The plants and their roses should reach full size in about three years. New questions are answered on the site every Tuesday and Thursday.