Fill nursery pots with equal parts of compost and sand or vermiculite. Water the mixture until it is soggy and set the pot aside to drain while you take the cuttings.
Lift the poppy from the soil and run a slow stream of water from the hose over the roots to clean off the soil.
Choose root sections that have the thickness of a pencil. Cut them close to the crown, straight across.
Cut the root sections into 4-inch pieces, making a straight cut at the top of each piece and an angled cut at the bottom.This will help you remember the top from the bottom of the root cutting.
Stick the cuttings into the planting medium until the straight end is even with the soil. Sprinkle a 1/8-inch layer of sand over the top.
Place the red poppy root cuttings in a cold frame, or a lightly shaded area that remains below 60 degrees Fahrenheit. Look for the poppy's root cuttings to sprout in the spring.