Oenothera speciosa 'SISKIYOU'

Oenothera speciosa
Oenothera speciosa 'SISKIYOU'
evening primrose
SIZE/TYPE low or groundcovering
 low perennial
LEAVES deciduous broadleaf
COLOUR OF LEAVES light green
COLOUR OF FLOWERS +multicolored:white and pink
BLOOMING TIME July - October
LOCATION full sun
USDA zone (lowest) 5   (down to -29°C)
FOR ZONE 5+6 Code of winter protection zone 5+6
FOR ZONE 7 Code of winter protection zone 7
Summer blooms
náhled fotonáhled fotonáhled foto
Evening primrose is a large genus of many annuals, biennials, and most importantly perennials from sunny and hot landscapes of North America, S.W. USA, and Mexico. A lot of perennial species are hardy enough for C.E. climate, too, they just resent water-logged soils. In our country mostly yellow flowering species are cultivated, especially appreciated for their evening performance of fast flower opening which happens just before your eyes and takes some 5-10 minutes.

Siskiyou is a gorgeous variety of evening primrose producing daytime flowers. They are 5-6 cm wide, weakly fragrant, saucer-shaped, white with pink veins and soft pink hues towards the petal margins. The centre is yellow. Blooming time is often the reason why this perennial evening primrose is so popular - flowers open from early July and continue until early autumn. Leaves are narrowly lance-shaped, medium green, shallowly toothed. Stems are 20-30 cm tall and apart from the side ones they do not tend to bend or creep.

Evening primrose naturally occurs in rocky and dry locations with plenty of sun. They hate water-logged, cold, boggy soil. Grow them in poor to only moderately fertile, free-draining, sandy soil or a rockery of any pH, though they prefer neutral to alkaline reaction. Evening primrose is a fast grower forming root runners which are perfect if you want to fill a larger area, however, they may need to be removed if you want to keep the plant in one clump. Hardy to min. -29°C (USDA zone 5b), some sources even believe it can take -34°C (not tested).

Last update 27-07-2019

  • STANDARD QUALITY - Plants of this group are 1st class quality with number of branches and overall density adequate to their size and age, considering they were container grown.
  • DE LUXE QUALITY - This label guarantees a luxurious quality of manually selected plants that, compared to their height and age, are exceptionally dense and beautiful.
  • EXTRA - These plants are usually mature and bigger specimens with exceptional overall appearance.
  • STANDARD (as described in the plant form) means a tree with a trunk of 190-210 cm and a crown at the top, unless specified differently. The commercial size for trees is their girth measured in the height of 1m from ground.
  • HOBBY - These plants are of the same quality as our standard-quality plants but younger and therefore cheaper.
  • SHRUB - a woody plant with branches growing bushy from the ground level.
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  • GRASSES and PERENNIALS - Sizes given usually read the diameter of the pot or the clump, as specified.
LARGE PLANTS over 150 cmspecimens, screening and hedging shrubs

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