Japanese Poppy
Hylomecon japonica

Family: Papaveraceae (pa-pav-er-AY-see-ee) (Info)
Genus: Hylomecon (hy-LOH-mee-kon) (Info)
Species: japonica (juh-PON-ih-kuh) (Info)

Category:

Perennials

Height:

6-12 in. (15-30 cm)

Spacing:

9-12 in. (22-30 cm)

Hardiness:

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

Danger:

Unknown - Tell us

Bloom Color:

Bright Yellow

Bloom Time:

Late Spring/Early Summer

Foliage:

Unknown - Tell us

Other details:

Unknown - Tell us

Soil pH requirements:

6.1 to 6.5 (mildly acidic)

6.6 to 7.5 (neutral)

Patent Information:

Unknown - Tell us

Propagation Methods:

By dividing the rootball

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

Seed Collecting:

Unknown - Tell us

Regional

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

East Haddam, Connecticut

Gardeners' Notes:

1
positive
0
neutrals
0
negatives
RatingContent
Positive

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

A charming ephemeral, fully hardy to zone 6. Makes attractive divided foliage in April, blooms for 2 weeks in May, then is gone for the rest of the year. Sun/light shade (NOT a shade plant) with severe drainage gives the best results. Flowers are attractive, like a miniature yellow poppy. Worth a try!