Growing climbing roses in pots takes care and attention. Grow climbing roses in pots to be located on decks or patios or to spruce up a paved area. Climbing roses that are too tender for the winters in your area can be grown in pots and then moved to a protected location when the temperatures begin to drop. Most roses will do well in pots of the appropriate size, but climbing roses also require support that is portable along with the pot.
Large climbing roses require large 24-inch pots, in which support may be provided. Durable, lightweight plastic pots are best to accommodate moving to a sheltered area for winter protection, because the ease of moving them. Use heavier concrete pots in places where they won't have to be moved.
Use a potting mixture of redwood bark, fir bark, perlite, sphagnum peat and sand, with smaller amounts of alfalfa meal, bone meal, sea kelp and cottonseed for a growing medium that has adequate drainage and needed nutrients. Grow a single rose per pot. Do not add other plants, as delicate rose roots are close to the surface and are easily damaged. Potted roses require more frequent watering and fertilisation than roses grown in a bed. Keep the soil moist but not wet. Do not allow soil to dry out completely. Adjust the watering schedule to accommodate the season, watering more often during vigorous spring growth and less as the dormant season nears. Fertilise the pot every two weeks with liquid compost tea. Spray one to two times a month with baking soda spray to prevent aphids and spider mites.
Provide a trellis or other type of support. Place the support into the pot and secure sides with wire. Fill the bottom of pot with enough potting mixture to allow the rose base to sit about 3 inches below the rim. Gently set the rose into the new pot with one side of base against support. Fill the pot, covering rose base with about an inch of potting mixture. Tamp the pot to firm soil and settle the plant and the support in place. Fill the spaces left after tamping and again after watering with compost tea to ensure the support is secured in potting mixture.