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Bright yellow, fragrant, cup-shaped flowers appear on 7-inch-tall plants in spring or early summer, opening each evening after sunset and closing before noon the following day. This species dies after its second year but self-seeds readily.

On the other hand, evening primrose flowers are often short-lived and close or wither during the day. The main factor in when a plant blooms is how it's pollinated. Night-blooming plants, such as evening primroses, attract moths for pollination, so blooming in the evening gives them an advantage for reproducing.

Primroses tend to prefer climates with cool summers — plant in partial shade to avoid the intense summer heat. Many primroses will take full sun, but usually require constant or at least good moisture levels. As a rule, primroses do not like to dry out. This does not mean that they like to be water-logged.Dec 3, 2021

Growing Primrose – Primrose Plants In Your Garden. Primrose flowers (Primula polyantha) bloom in early spring, offering a variety of form, size, and color. ... In fact, when given the proper growing conditions, these vigorous plants will multiply each year, adding stunning colors to the landscape.Apr 7, 2021

When primroses stop blooming, you can dig the plants up and divide them. You can minimise any damage to the root by placing each clump in a bucket of water and gently washing away any soil from the roots. You can then discard the old plant and replant the new crowns.Nov 25, 2021

The plant, an evening primrose, blooms every night for several months. Each night, less flowers open. The process beings at about 8:45 p.m. when the buds slowly open, transforming into a beautiful yellow flower. ... During the night, flying hummingbird moths come out to pollinate the flowers.Aug 19, 2015

In the wild, primroses are colonising plants that gradually spread from an original clump. By dividing the clumps, gardeners can take advantage of this tendency to spread to get new plants for free. Summer through to autumn is the best time to divide them, but you can also try this with newly bought plants, too.Sep 23, 2019

Deadheading Primroses

By removing the spent flowers, you prevent your plant from going to seed, and allow it to mature. Cutting back the spent flower stems also encourages new growth, so you'll see fresh flowers. ... Certain floral diseases easily spread when fingers flit from one flower to another.

The evening primrose needs to be in areas with well-draining soil rich in organic matter. It also needs to be moist during the growing period, although the plant is hardy and able to survive tough conditions.Feb 1, 2021