There are several ways to start a new rose bush, and for most of us, the easiest ways are to purchase a bush at a greenhouse or garden center or root one with a cutting from an existing bush. If you're adventurous, you can gather seeds from a rose bush. To gather rose seeds, don't be in a hurry to cut the faded blooms, which will be replaced by plump rose hips, with the seeds hidden inside.
Allow several roses to remain on the bushes after the growing season. Leave them until they dry up and the petals fall off.
Look for the plump green rose hip at the base of the blooms. The hips initially be green, and will turn yellow. When the temperature drops below freezing, the rose hips will turn red and will be ready to harvest.
Pick the rose hips from the bushes with your fingers. Spread the hips on a large tray and let them dry until the hips just begin to shrivel. Don't allow the hips to dry completely, because it will more difficult to remove the seeds.
Split the rose hips open with a sharp knife and scoop out the seeds with the handle end of a spoon or some other blunt tool.
Spread the seeds on a paper plate, and put them in a cool, dry place to finish drying. When they're dry, put them in an envelope and store them in a cool, dry place until spring.