While dried rose petals or a pressed blossom are two ways to preserve the memory of a special bouquet, a rose bush rooted from a special rose is a more permanent keepsake. Roses are easy to grow from cuttings and with special care and a little luck you can grow a rose bush from a rose. Choose sturdy blossoms, the fresher the better. Thicker stems are easier to root than thin ones. Don't use blossoms that have been treated with a preservative. Root several blossoms for a single bouquet to increase your odds of successfully propagating a rose bush.
Cut the stem of the rose at an angle. Snip off the flower head as well and strip off any leaves on the bottom third of the stem.
Fill the pot with potting soil. Make a hole in the center of the soil for the rose.
Dip the freshly cut stem of the rose into the rooting hormone. Insert the stem into the hole in the potting soil, being careful not to scrape off the rooting hormone. Tamp the soil around the stem.
Water the pot and keep the rose stem in a sheltered location. Keep the soil damp but not soggy. Growth may be slow, but by the end of six weeks, you should have roots and new buds showing along the stem. At this point, transplant the rose to a larger pot.
Transplant your rose bush into the garden after three months. It may be a year before you have blossoms, though some varieties will bloom faster.