Take a cutting from the rose bush you would like to grow your new bush from. The support must be large enough and sturdy enough to hold the climbing rose in wet and windy conditions at its mature height. All About Climbing Roses Stark Bro S Leave the cuttings in for a week or two or longer. How to start a climbing rose from a cutting . Then pop the cuttings into a trench with gritsand added to the bottom of the trench should get shade during the hottest part of the day backfill with soil and be patient for rooting to occur cant recall how long though could be done AugustSeptember time. Propagating roses from cuttings is one of the easiest gardening techniques. Tamp the potting soil lightly around the cutting. Choose a support that encourages horizontal growth such as a fence over a support that allows vertical growth such as a rose tower. Gently push the cutting down several inches into the soil or half the length of the cutting. Selecting rose cutting material from the cu