The next step how to grow roses from seed is to sprout the rose seeds. After having gone through their “stratification” time, take the containers out of the refrigerator and into a warm environment of around 70 F. (21 C.). I do my best to time this for early spring when the seedlings would normally be coming out of their cold cycle (stratification) outside and starting to sprout. Once in the proper warm environment, the rose bush seeds should start to sprout. The rose bush seeds will usually continue to sprout over the course of two to three weeks, but probably only 20 to 30 percent of the rose seeds planted will actually sprout. Once the rose seeds sprout, carefully transplant the rose seedlings into other pots. It is extremely important not to touch the roots during this process! A spoon may be used for this seedling transfer phase to help keep from touching the roots.