Libre primrose (Primula Obconica) is an evergreen perennial commonly grown as a houseplant or garden annual. The libre primrose produces blossoms in colors such as pink, blue, orange, yellow, lavender and white. The flowers range in size from one to two inches. The coarse leaves grow to six inches in length. This flower is often planted as an annual groundcover but will act as a long-lived perennial in gardens when properly cared for.
Soil Requirements for Primroses
Primroses grow their best in soils that are rich in moist organic matter and have good drainage. The soil needs to be acidic with a pH of 5.5 to 7.
Light Requirements for Primroses
Primroses need a shady location when planted in regions with strong sun. Planting them beneath bushes or trees will provide the shade that keeps them from frying. If planted beneath other plants they will require more frequent watering. Shade cloths are helpful in areas where natural sun blocks are not possible. It is ideal to plant them where some shade will fall on the plants during the harshest parts of the day. In areas where the sun is more forgiving, primroses will grow well in full sun.
Pruning Requirements for Primroses
Pinching off fading blossoms will promote more blooming. Removing dead, dying or damaged foliage will make the plants more attractive and prevent possible diseases.
Water Requirements for Primroses
Water whenever the soil starts to dry out one inch beneath the soil surface. Primroses thrive in moist areas and extended periods of drought will harm their health. Conserve water by adding organic mulch throughout the entire primrose flower bed.
Fertilizer Requirements for Primroses
A well-balanced fertilizer made for flowering plants will promote masses of blossoms. The bag should read 10-10-10 or 5-10-5. High amounts of nitrogen will promote the growth of foliage at the expense of blossoming. Fertilize primroses early in the spring for best results.
Growing Potted Primroses
A well-drained and acidic potting mix should be used when growing primroses in pots. If being kept indoors provide them with a bright sunny window and several hours of sunlight a day. Check often for whiteflies, aphids and other pests on the plants and the surface of the soil. When leaves begin to yellow, they need to be removed. Pot grown primroses will dry out quicker than those planted in the ground and will need watering more often.