Outdoors, it thrives in partial shade, generally in U. Department of Agriculture plant hardiness zones 3 through 8, and provides vivid bursts of color in early spring and continues to bloom through summer, notes Cornell University. In USDA zones 9 and 10, it can be planted in late winter or early spring and will behave as an annual. The primrose plants you see blooming colorfully in shops during the post-holiday, winter doldrums are grown specifically to enjoy indoors for a short period of time.
Primroses are difficult to maintain indoors for any significant length of time, as they prefer cooler evening temperatures of 50 to 60 degrees Fahrenheit and do not like to be root bound. If you would like to grow one of these plants outdoors, introduce the plant to an outdoor environment gradually, as such plants were likely raised in hothouses and need to be acclimated slowly.
Place them outdoors during the day and bring them indoors at night for one week before transplanting them in a garden bed. Alternatively, purchase primrose plants from a local nursery that has already acclimated them and plant them directly outdoors. From eastern Tibet comes this striking black- or very dark purple-flowered species. Primula melanantha flowers in late spring and early summer, and will grow well in a partially shaded spot in moist, well-drained soil.
Primula denticulata is aptly named the drumstick primula and is often available in a range of flower colours, depending on the variety.
It flowers from May to June and grows best in a moist, humus-rich soil in partial shade. Commonly known as the Tibetan or giant cowslip, Primula florindae is a beautiful species with fragrant yellow flowers on tall stems, appearing from June to August.
It thrives in moist soil in full sun or partial shade. It looks beautiful planted en masse. For best results, grow it in reliably moist, well-drained soil in full sun or partial shade. The mealy primrose, Primula pulverulenta is a gorgeous species bearing wine-red flowers from late spring to midsummer.
Considered one of the easiest primulas to grow, it needs reliably moist soil, for example boggy soil, in full sun or partial shade. Browse the fantastic range of fully mature hardy perennials, shrubs, ferns, grasses and bulbs to create a spectacular garden to enjoy all year round.
Use code: GW Kick start the festive season and get in touch with your creative side with our minute online class on creating Christmas wreaths with natural materials. The perfect seasonal addition to your garden, these low-maintenance expertly trained evergreen trees can be enjoyed for years to come. Home How to Grow plants How to grow primroses and primulas. How to grow primulas — Primula pulverulenta growing at the pond edge.
How to grow primulas — planting primulas. How to grow primulas — Primula beesiana. How to grow primulas — dividing a primula. How to grow primulas — Primula aricula. Primula bulleyana.
Primula beesiana. Primula veris. Primula sikkimensis. Eventual size height x width : Typically spreads to form a low carpet, around 20cm by 35cm. Plant primroses in early autumn to allow for establishment before a going dormant for a period. You can also find them in Garden Centres from late winter for instant impact. Plant them 6 to 12 inches apart and 4 to 6 inches deep. Primroses thrive in damp conditions so water them thoroughly after planting and continue to do so throughout the season.
Add a mulch to encourage moisture retention. Primroses are very easy to care for. Simple pruning, with deadheading as needed, will suffice. Cut them back in late autumn, when the foliage has died, to encourage maximum growth in spring. A good layer of mulch will help retain soil moisture, but they do not like to be constantly soggy. Species types are somewhat more tolerant of wet soils. Hybrid primroses are hardy in zones 5 to 7, but are often grown as bedding annuals in warmer and colder zones.
There are some species types that are hardy as far north as zone 2. But no primroses are suitable for USDA Zones above 9 and up because they require a winter chill to survive and bloom. Hybrid primroses need regular feeding with a half-strength liquid fertilizer—a requirement that's common with profusely flowering plants.
Species types can be over-fed, however, and do well with just a single spring feeding. It's easy enough to lift and divide primrose plants after flowering. This is the best way to multiply your batch since it guarantees you can maintain specific cultivars. When starting plants from seed , a temperature between 40 and 50 degrees Fahrenheit is required from sowing to first bloom, which is next to impossible to attain indoors.
Growing primroses from seeds is a tricky business that is usually discouraged. Primroses purchased as potted houseplants that are forced for early blooming can be kept growing almost indefinitely, moved outdoors during summer and back indoors for winter. However, they will soon revert to their normal flowering rhythm, which is to bloom in early spring. But plants can quickly become root-bound unless they are divided or potted up annually into larger pots.
Use a standard commercial potting mix when growing primrose in pots, making sure the pots have good drainage. Regular repotting can also prevent excessive fertilizer buildup that can ruin plants. Primroses are generally pest-free, but spider mites can be occasional problems, especially when the plants are heat-stressed.
Less frequently, plants may be troubled by mealybugs, aphids, and whiteflies; they are best treated with non-chemical remedies, such as horticultural oils.
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