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Asiatic Primrose, Cortusoides Primula

Primula sieboldii

Family: Primulaceae
Genus: Primula (PRIM-yew-luh) (Info)
Species: sieboldii (see-BOLD-ee-eye) (Info)
View this plant in a garden



Foliage Color:

Unknown - Tell us

Bloom Characteristics:

Unknown - Tell us

Water Requirements:

Average Water Needs; Water regularly; do not overwater

Where to Grow:

Unknown - Tell us


6-12 in. (15-30 cm)


12-15 in. (30-38 cm)


USDA Zone 4a: to -34.4 C (-30 F)

USDA Zone 4b: to -31.6 C (-25 F)

USDA Zone 5a: to -28.8 C (-20 F)

USDA Zone 5b: to -26.1 C (-15 F)

USDA Zone 6a: to -23.3 C (-10 F)

USDA Zone 6b: to -20.5 C (-5 F)

USDA Zone 7a: to -17.7 C (0 F)

USDA Zone 7b: to -14.9 C (5 F)

USDA Zone 8a: to -12.2 C (10 F)

USDA Zone 8b: to -9.4 C (15 F)

USDA Zone 9a: to -6.6 C (20 F)

USDA Zone 9b: to -3.8 C (25 F)

Sun Exposure:

Sun to Partial Shade

Light Shade


Unknown - Tell us

Bloom Color:

Pale Pink



Magenta (Pink-Purple)

White/Near White

Bloom Time:

Late Spring/Early Summer



Other details:

Unknown - Tell us

Soil pH requirements:

5.6 to 6.0 (acidic)

6.1 to 6.5 (mildly acidic)

6.6 to 7.5 (neutral)

Patent Information:


Propagation Methods:

By dividing the rootball

From seed; direct sow outdoors in fall

From seed; winter sow in vented containers, coldframe or unheated greenhouse

From seed; stratify if sowing indoors

Seed Collecting:

Allow seedheads to dry on plants; remove and collect seeds


This plant has been said to grow in the following regions:

Juneau, Alaska

Ellicott City, Maryland

Jamaica Plain, Massachusetts

Roslindale, Massachusetts

Hopkins, Minnesota

Saint Paul, Minnesota

Webster, New York

Raleigh, North Carolina

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Gardeners' Notes:


On Oct 8, 2012, coriaceous from ROSLINDALE, MA wrote:

A beautiful, tough, trouble-free plant that's well adapted to eastern North America---here it's the easiest of all primroses to grow.

Beautiful showy flowers in late spring, later than most primroses, held above the attractive foliage in umbels bearing 6-11 flowers.

If you want a common name for it, Siebold primrose is unambiguous. There are many different species of Asiatic and cortusoides primroses.

Flowers show a great deal of genetic variability in color, patterning, size and form, and hundreds of distinctly different cultivars have been named. Colors range from white through soft pink to magenta or bluish lavender, and may differ on the petal reverse. Petals may be smoothly rounded, or as intricately cut as snowflakes. Check Google images... read more


On Jun 1, 2011, ms_greenjeans from Hopkins, MN (Zone 4a) wrote:

This a beautiful spring flowering perennial. It does go dormant in the summer, but until then the color of the flowers and the light green foliage simply glow in my shade garden. I can't even describe the flower color - but I love it. The very small initial plant has now become a small colony, and I hope it continues to increase. Very hardy and trouble-free.


On Jan 25, 2007, bluespiral from (Zone 7a) wrote:

December 5, 2007 -

There's a winter sowing database now in the works, so this comment may be totally unnecessary. But for now, let me follow up on how my efforts to germinate seed of this plant went last winter: I sowed the seed on top of a layer of sand over plain ol' potting soil in a qt-size recycled yogurt container and put it outdoors on February 18, 2007. The seeds began germinating on April 1, and I now have some beautiful plants that look like they'll flower next spring. That's all there was to it - all of the detail below wasn't necessary in light of the fact that for centuries people have been putting pans surface-sown with primrose seed outdoors over winter and winding up with plants in spring.

The seeds seemed to be kept from washing out by ... read more


On Dec 4, 2004, Todd_Boland from St. John's, NL (Zone 5b) wrote:

This Japanese-Siberian species of primrose makes a good addition to the woodland garden. They have light green, crinkled leaves. A 6-8" stem arises with a few large white , pink or reddish flowers, often with a white 'star' in the centre. Very attractive species that is available in a number of named selections. The plant will go dormant my mid-late summer so carefully mark the area so you will know where it was planted.