Primula obconica, more commonly known as German primrose or "Libre Magenta" is an evergreen perennial flowering plant that is prized for its vibrant red, orange, yellow, lavender, peach or purple blossoms. Primula obconica is a desert plant and won't grow outside in the UK, but you can rear it as a houseplant. Primula obconica are attractive, low-fuss plants that make excellent additions to home landscapes and container gardens.
Most flowers require a certain amount of sunlight for healthy development and Primula obconica is no exception. If exposed to too much direct sunlight, however, a Primula obconica's flowers and foliage can become faded, wilted and burnt. For best results, plant or position primroses in a partially shaded location where they can receive at least three, but no more than six, hours of direct sunlight per day. Locations that offer morning and early afternoon sunlight are ideal -- the heat from late afternoon sunlight may be too much for your Primula obconica to handle.
Primula obconica prefers moist, well-draining soil that is rich with organic materials. Healthy drainage is important; growing primroses in soil that is consistently wet or prone to flooding may invite fungal disease or promote root rot. Unsuitable soil can be amended to make it more hospitable for your Primula obconica; work 12.5 cm (5 inches) of equal parts humus, peat moss, aged manure, well-rotted compost and perlite into the top 20 cm (8 inches) of soil to improve nutrition and drainage.
Primula obconica performs best when grown in consistently moist soil. Provide primroses with 1.25 cm (1/2 inch) of supplemental irrigation twice a week when rainfall is insufficient. Check the moisture of the soil before watering; irrigate your Primula obconica when the top 1.25 cm (1/2 inch) of soil is dry to the touch. Topping the soil around your primroses with a 7.5 cm (3 inch) layer of peat moss, grass clippings or wood chips will help to conserve soil moisture and reduce the need for supplemental irrigation.
Fertilising Primula obconica at the beginning of each growing season helps to ensure that your flowers have the nutrients that they need to develop healthy foliage and vibrant blossoms. Primroses respond well when fed with balanced, water soluble fertilisers; avoid high nitrogen fertilisers that can stimulate foliage growth at the expense of blossom production. Whatever type of fertiliser you use, follow the application instructions on the fertiliser box to ensure successful fertilisation.