The bloom period lasts until midsummer in most locations and can be extended with a little extra attention. The post-bloom period of the primrose is the time to prepare for next season's floral display. As a woodland plant, primrose benefits from summer shade and organic mulch to maintain moisture and for fertilization.
Most of the plus species of primrose grow as perennials in U. Department of Agriculture plant hardiness zones 3 to 8. Primula obconica is an exception, growing in USDA plant hardiness zones 10 and 11, where it is most often treated as an annual and discarded after its bloom season.
As individual flowers fade, pinch them out at the base of the stem. Removing spent flowers is called deadheading, which keeps plants looking tidy and lengthens the flowering period. Uninterrupted, flowering leads to seeding, a natural flower reproduction system.
Removal of flowers prevents seed formation. In a self-preservation effort, plants continue to flower until environmental conditions, such as high heat or freezing temperatures, induce dormancy.
I planted some on the sunny side of a hedge and they have flourished, even though my soil is rather heavy. I bought them as a tray of plugs, which is a very good way of buying wild flowers cheaply. Mine have cross-pollinated with the primroses to produce sterile hybrids — the false oxlip — with the tall stem of the cowslip and the larger flowers of the primrose. The true oxlip, Primula elatior, is rarely found in the wild apart from in a few woods in East Anglia. Visually, it combines the virtues of both cowslip and primrose, and it is a very good indicator of ancient woodland, so a sighting is to be treasured.
You can buy P. They prefer the same woodland setting as primroses. Polyanthus were a result of crossing primroses and cowslips. They have multiple large flowers on a long stem in a far wider range of colours than primroses, including reds, mauves, purples and pinks. But while they look jolly and bright, for me they are nothing like as beautiful as a plain primrose or cowslip. The most famous polyanthus display is probably in the Nuttery at Sissinghurst Castle, Kent.
All these primulas can be divided and moved, and the best time to do it is immediately after flowering, so they can be ready to regrow for as long as possible before the next flowering.
All primulas suffer from replant disease though, which means that if you plant fresh primulas on the same site — using polyanthus as bedding plants, say — you will need to change the soil every few years or rotate the sites to give the soil a rest for a few years.
No comments have so far been submitted. Why not be the first to send us your thoughts, or debate this issue live on our message boards. They can adapt well to the indoors, but the temperatures should remain cool in an ideal range of between 50 and 60 degrees, Greenfield Flower Shop says. Perhaps it's the beauty of the impending blooms that compels so many gardeners to start their collection from seeds, using equal amounts of soil, peat moss and sand.
Once two or three leaves sprout, the seedlings are ready to be planted outdoors depending on the weather, of course. From this point on, primrose flowers aren't difficult to grow or nurture, but they do know what they like.
They prefer a shady spot in soil rich with hummus and organic mulch. Plant them at least 6 inches apart; 12 inches would be better to give them enough room to spread out.
Primroses are especially thirsty through the summer, which means they appreciate a thorough watering once a week. A layer of mulch will help them retain this moisture and indulge their preference for staying cool.
Primrose flowers don't need a lot of encouragement to last, but they do respond well to an occasional infusion of organic fertilizer. Staying vigilant about pruning dead leaves and blooms will encourage your flowers to rejuvenate. If you're intent on making your primroses last indoors, your strategy comes down to three basic steps: Keep them in a cool spot away from direct sunlight and never allow them to sit in water.
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