Instructions:
Place the seeds in a damp material. Rose seeds typically won't sprout unless they are kept in cold, wet conditions, mimicking a winter environment. Place the seeds between two layers of lightly dampened paper towels, or in a container of dampened salt-free river sand, peat moss, or vermiculite. This is the first step in a process called stratification...
Leave the seeds in the fridge for several weeks. Put the seeds and moist material in a plastic bag or seedling tray in a plastic bag or seedling trays, and keep them in a cold area of a refrigerator, such as an otherwise empty crisper drawer. Do not keep them in same area of the refrigerator as fruit or vegetables, which can release chemicals that prevent the seeds from developing.....
Keep the seed medium slightly damp. Check at least once or twice a week to see whether a sprout has emerged from the seed casing. Add a few drops of water to each paper towel whenever they begin to dry out. Depending on the rose variety and individual seeds, the seeds could take anywhere from four to sixteen weeks to germinate. Often, 70% or more of the seeds never sprout at all.....
Fill a container with sterile seed starting mix. Small seedling starting trays make it easy to care for many seeds at once. Alternatively, use plastic drinking cups with a hole punched in the bottom, to make root growth easier to view. Regular soil is not recommended, as it may not drain well enough and cause the seedlings to rot.....
Plant the seeds. Some store-bought seeds can be planted immediately. If you germinated your own seeds as described above, plant them as soon as they begin to sprout. Plant with the sprout pointed downward, as this is the root. Lightly cover them with soil, about 1/4 inch (6 mm) deep. Space seeds at least 2 inches (5 cm) apart to minimize competition. Sprouted seeds should emerge as seedlings within a week. Store-bought seeds that do not require home stratification may take several weeks. Seeds that have not been stratified, using the germination process above, may take two or three years to emerge.....
Keep the seedlings in warm, moist soil. Keep the soil damp, but not soggy. A temperature between 60 and 70ºF is(16–21ºC) is ideal for most rose varieties. The seedlings typically thrive on six hours of sun or more each day, but you may wish to research the parent rose's variety to get a better idea of what your rose's prefer.....
Learn when it's safe to transplant seedlings. The first two leaves visible are usually "cotyledons," or seed leaves. Once the seedling grows several "true leaves," with a more typical rose leaf appearance, it is more likely to survive transplanting. Transplanting is also easiest in winter or early spring, not during the height of the growing season. It may be a good idea to transplant the seedlings soon if you notice the plant is root-bound, with its roots encircling the container. Do not transplant it outside until after the last frost.....
Transplant to a larger pot or outdoors. When you decide to transplant, wait for cool, cloudy weather or early evening, when the plant is losing less water. Moisten the seedling to keep the soil around it together. Dig a hole in the new location, large enough for the root mass, then remove the soil around the seedling in a clump. Transfer this soil clump into the new location, filling the hole with potting soil if the ordinary garden soil is low quality. Water the soil thoroughly after transplanting. Try to plant to the same level as before. Do not bury part of the stem that was previously above the soil level.....
Once the transplanted seedling is looking healthy again, you can start watering it as normal. Fertilizing a few times during the warm growing season may help your plant grow and bloom if you follow the fertilizer instructions, but keep in mind that some varieties of rose will not bloom at all during their first year of life.....