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.
Take a sterile Q-Tip or small sable artist's brush, and dip it into the rose pollen you want to use. Then dab the pollen-coated Q-Tip or brush onto the stigma of the rose you have selected as the seed (female) parent. You could also simply use your finger to apply the pollen to the rose. Repeat this procedure after four hours, and then again after another four hours. Label the rose hip with the name of the seed parent as well as the pollen parent, i.e. Fairhope x Miss Flippins. The name that appears first is always the seed parent (the mother), and the second name is the pollen parent (the father).
Fertilizer: Roses are heavy feeders, and will benefit from a steady supply of nitrogen, phosphorus and potassium. You can provide these nutrients with either liquid or granular fertilizers, at a ratio of approximately 5-8-5. In most cases, regular applications of compost, rotted manure, fish emulsion and seaweed extracts will provide roses with all the nutrients they need. These organic amendments also help to moderate pH imbalances and stimulate beneficial soil life. Other organic amendments favored by rose growers include greensand, black rock phosphate and alfalfa meal.