Japanese Wood Poppy

Glaucidium palmatum

Family: Paeoniaceae
Genus: Glaucidium (glah-SID-ee-um) (Info)
Species: palmatum (pahl-MAY-tum) (Info)



Foliage Color:

Unknown - Tell us

Bloom Characteristics:

Unknown - Tell us

Water Requirements:

Requires consistently moist soil; do not let dry out between waterings

Where to Grow:

Unknown - Tell us


18-24 in. (45-60 cm)


15-18 in. (38-45 cm)


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:

Partial to Full Shade


Unknown - Tell us

Bloom Color:


Bloom Time:

Mid Spring

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:

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 pods to dry on plant; break open to collect seeds


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

Anchorage, Alaska

Palmer, Alaska

East Haddam, Connecticut

Louisville, Kentucky (2 reports)

Taylorsville, Kentucky

Norway, Maine

Shelburne Falls, Massachusetts

Saint Louis, Missouri

Pequannock, New Jersey

Hillsdale, New York

Wilkes Barre, Pennsylvania

show all

Gardeners' Notes:


On Feb 19, 2014, Anisotome from Tresta, Shetland Islands
United Kingdom wrote:

A treasure in a cool damp climate, where those delicate lilac/lavener poppies last for weeks. Best in well-drained, acidic soil or pure peat. Easily raised from seed, sown as soon as ripe and kept outdoors. Seedlings take 3-4 years to reach flowering size - well worth waiting for.


On Jan 4, 2014, Loretta_NJ from Pequannock, NJ wrote:

This plant lasted a couple of years. It was a little late to show and went to sleep early. The flowers were pretty but didn't last long. It handled NJ humid summers and our sandy loam. I never saw it wilt during drought but it never became nice and full either. It produced plenty of seed but didn't self sow.


On Mar 19, 2011, jrtinker from Palmer, AK (Zone 3b) wrote:

This lovely shade plant has proven hardier than expected. Best results for germination have come from sowing the seeds around the parent plant and letting them germinate when they want. Have also used GA-3 treatment successfully, and leaching/washing the seeds in a nylon sock suspended in a toilet tank for several weeks worked, too.


On Dec 30, 2010, dave12122 from East Haddam, CT wrote:

This is a hard plant to find in flowering size. If grown as a smaller plant, it can take 3-4 YEARS to flower. Mice find the roots attractive, so put rocks around the crown so they can't dig. Needs rich soil in at least partial shade. Lovely in bloom, but a little fragile when young and needs to be monitored closely.


On Aug 18, 2001, mystic from Ewing, KY (Zone 6a) wrote:

This perennial is a native of Japan. It grows up to 20 inches high and wide. It has attractive, bright green, paired leaves, which are divided into 7 to 11 irregularly toothed lobes, at the ends of erect stems. The large, cup-shaped,poppy-like flowers,are pale mauve. They are borne singly on thin stems in late spring.