Oenothera macrocarpa description:
Massive, rich golden flowers through the summer and into early autumn.
The flowers open in the late afternoon.
A pollinator friendly plant including bees.
This is a butterfly friendly plant.
How easy is it to grow:
This has won the RHS Award of Garden Merit . To win this impressive accolade the plants must have outstanding excellence for decorating a garden, be robust, not require highly specialist growing conditions or care and not be particularly susceptible to any pest or disease.
Good for the front of a border, or a wildlife area, but it does need a soil that is well drained, so do not try if you’ve got a clay or heavy soil. Also it can be short-lived, but there is a chance that it will reseed itself.
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Common names: Missouri Primrose, Evening Primrose and Ozark Sundrops.
Also known as: Oenothera missouriensis.
The best position in the garden:
Is it useful as a groundcover plant?
Yes, it makes a solid green low mound.
What type of soil:
Well drained soil, also tolerates acidic soil and chalky soil.
How much moisture:
Normal moisture or dryish stony.
Hardiness and, or, lifespan:
Hardy, provided the drainage is good. Tends to be biennial, but it does gently reseed itself.
Care and maintenance:
When newly planted always keep it watered until the roots have grown down and it is able to find its own moisture.
Size of plant:
Height 30 cm.
Spread 50 cm.
Planting density – to calculate how many plants are required in a planting scheme:
Allow 4 plants per square metre.
Buy perennials and alpines.
 Royal Horticultural Society – opens in a separate window.