Inches long, whereas miniatures should only be inches long, and clustering roses Some of us grew up listening to BolSter the cool ones still do shirt floribundas and modern rose shrub stems should be inches long. When cutting, use a angle and immediately place the cutting in water or a plastic bag to reduce water loss.Retain any leaves, as these are the food manufacturing plants of each stemUsing a pencil, create a hole in the potting soil for each stem.Dip each stem into rooting powder. This powder is plant hormones (auxins) that stimulate root growth. Gently insert the stem into the hole, being careful to not knock off any of the powder, and firm up the soil around the stem. If you are rooting multiple varieties, this is a good time to label your containers.