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AGM plants have been through a rigorous trial and assessment programme. They are:
This plant will provide nectar and pollen for bees and the many other types of pollinating insects.
It is included in an evolving list of plants carefully researched and chosen by RHS experts. Divided into 3 groups these lists, linked below, are maintained by a team of RHS staff and are reviewed annually.
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Other common names common evening primrose coffee plant
cure-all fever plant field primrose four o'clock German rampion large rampion night willowherb scabbish scurvish wild four o'clock
Synonyms Oenothera odorata Oenothera glabra
Family Onagraceae
Genus Oenothera can be annuals, biennials or perennials, upright or spreading in habit, with simple or lobed leaves and bowl-shaped, white, yellow or pink flowers over a long period in summer
Details O. biennis is an erect biennial to 1.5m, with a basal rosette of oblong leaves and long, leafy racemes of bowl-shaped, fragrant, yellow flowers which open in the evening in summer and autumn
Foliage Deciduous
Habit Columnar/Upright
Fragrance Flower
Hardiness
All ratings refer to the UK growing conditions unless otherwise stated. Minimum temperature ranges (in degrees C) are shown in brackets
H7
Full Sun
Partial Shade
Aspect South-facing or West-facing
Exposure Sheltered
Loam
Sand
MoistureWell-drained
SoilLoam, Sand
pHAcid, Alkaline, Neutral
Ultimate height 1-1.5 metres
Ultimate spread 0.1-0.5 metres
Time to ultimate height 1-2 years
Cultivation Grow in poor to moderately fertile, well-drained soil in full sun
Propagation Propagate by seed sown in early summer
Suggested planting locations and garden types Flower borders and beds Cottage & Informal Garden Wildflower meadow
Pruning Cut back after flowering
Pests Generally pest free
Diseases May be subject to powdery mildews and a leaf spot
RHS members can get exclusive individual advice from the RHS Gardening Advice team.
common evening primrose
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