English primrose naturalizes readily when planted in the landscape. When planted in containers over time they will become crowded and benefit from dividing and replanting in roomier quarters. Divide your primrose in the late spring or early summer immediately after bloom to allow recovery before the following year's flowering. Pot the divisions into fresh nutrient rich potting soil and water in well to lessen stress on the plant and encourage new growth.
Water your English primrose before dividing to make separation easier and the roots more pliable.
Slide the primrose out of its pot by leaning the pot on it side and carefully pulling the plant and soil out.
Pull apart or cut the mass of plants to divide them into new individual plants each with a center whorl of green leaves. Some root damage will occur--just work slowly and gently to minimize it.
Prepare a new pot partially filled with fresh potting soil. Place the divided primrose in the pot and add soil under the roots to raise the top of the plant to just an inch under the lip of the pot. Carefully distribute the roots and back fill soil around them to stabilize the plant.
Water the divided plants in deeply and keep the soil evenly moist until the plant is well established. Return the pot to it usual growing location.