Oenothera speciosa rosea
In contrast to its predominantly yellow flowered relative, this evening primrose produces white flowers that turn rosy pink from the outer edge of the petals inwards as they age. The plants grow 12-24" high and spread up to 15", sending runners out beyond that. The tough, slender, reclining stems support narrow spoon shaped leaves. The leaves tend to have deeply cut margins, especially near the base of the plant, where they are larger. The bowl-shaped flowers face skyward. They appear in mid-late spring and are nearly 2" across. Starting out as nodding buds, flowers emerge from long tubes in the upper leaf axils. The huge stamens at the center of the flower are bright yellow. There may also be a yellowish tinge to the base of the petals and/or a reddish tinge to their veins. Pink evening primrose comes from the south-central United States. It is native to the rocky prairies and savannas of the lower Midwest, but now commonly seen along roadsides and in disturbed areas over a much broader region. Pink evening primrose will grow nicely in poor soil. Plants are late to emerge in the spring, so their locations should be marked. They may not be just where you planted them though! Evening primroses tend to be surreptitiously invasive. They send their roots far and wide during the winter when no top growth is visible, then pop up everywhere in the spring. Moisture: Plants are likely to die of root rot if the soil is not well drained. They do fine in high humidity. Hardy to zones 6-10.
|How To Grow Evening Primrose From Seed|
Sow the seed in late spring. Choose soil that is well-drained and in a sunny position. The type of soil isn't really an issue provided it drains well. Evening primrose will grow in cool, warm, hot, arid, places; it's not too fussy.
When growing indoors, sow the seed thinly in pots containing seed starting compost. Press seeds in lightly, do not cover the seeds with soil as they need light to germinate. Make sure the compost is kept moist but not wet.
|Seeds germinate in 15 to 30 days at 18 to 21°C (65 to 70°F). Transplant to individual pots when seedlings are large enough to handle and plant outside when rosettes are at least 7cm (3in) across. If planting in full sun area pick a cloudy day so plants have time to adjust to their new surroundings before the full sun hits them.|
In outdoor beds, once the seedlings have developed two pairs of true leaves, thin out the weakest seedlings. Space seedlings or thin plants to 45cm (18in) apart. Grow in full sun and plant out in spring after all frosts. Water in well until plants have established then they can be ignored.
No care or maintenance is needed once plants are growing just cut down the stems at the end of the flowering period. Plant may reseed themselves but need to be in areas where they are not disturbed to develop for the following year. If intending to allow reseeding be aware of the rosettes and don't weed out. If mowing keep blade high to miss the low growing rosette.