Prim roses (or primroses, as they are more commonly named) are annuals desirable for their brightly colored flowers and ability to bloom in shady conditions. In warmer climates, they can be grown as perennials. Also called primulas, these cheerful flowers are some of the first spring bloomers and come in a wide variety of colors and sizes. In fact, there are more than 400 cultivars of primula, according to information published by Washington State University. These rewarding flowers are popular with home gardeners, in part because they need very little care once planted.
Provide rich, organic soil for your primroses. They grow best in soil that has a high amount of nutrients, according to information published by Washington State University. Amend garden soil with peat moss or choose a potting soil that has added peat moss or leaf mold.
Place or plant your flowers where they will be exposed to some bright sunlight, but not direct sunlight. The afternoon rays of the sun can be a bit intense for these flowers, causing them to wilt or the leaves to burn. Filter the light through a curtained window for indoor plants, or plant your primroses outdoors in dappled shade. These plants will grow in full shade, but they will not bloom as well as if they receive at least some sunlight.
Plant primroses so the crown of the root ball sits just above the surface level of the soil. Add a thick layer (3 to 4 inches) of mulch around your primroses after planting them. This will help the soil retain moisture and stifle weed growth, according to information published by Iowa State University.
Water enough so the soil is always barely moist but never soggy. Do not plant primroses where standing water collects, as this might rot the shallow roots of the plants. Primroses prefer soil that is always moist and cool, according to information published by Washington State University.
Deadhead wilted flowers (pinch or pluck them off) to encourage repeated blooming, and remove any discolored leaves to improve the appearance of the primrose.