Alphabetical Plant Listing

Glaucidium palmatum (Japanese Wood Poppy)

Japanese Wood Poppy, Palmate glaucidium


Highly sought after, Glaucidium palmatum (Japanese Wood Poppy) is a rhizomatous perennial forming a ravishing clump of large, palmately lobed, light green leaves, 8 in. wide (20 cm). The foliage alone makes Japanese Wood Poppy a memorable and must-have plant. In late spring and early summer, four-petaled, large and single, mauve to lilac flowers, 2 in. across (5 cm), appear above the foliage. Resembling miniature peonies or poppies, they feature a large bouquet of prominent stamens in their center. Japanese Wood Poppy does not perform well in warm climates. It also needs protection from desiccating winds in the winter. Long-lived if reasonably happy, it is incredibly beautiful when grown properly. Glaucidium palmatum is one of the gems of the woodland garden.

  • Winner of the Award of Garden Merit of the Royal Horticultural Society.
  • Grows up to 20 in. tall and wide (50 cm).
  • Thrives in part shade to full shade in humus rich, moist, well-drained soils. Protect from cold drying winds. Dislikes high temperatures and thrives in cool, moist climates.
  • Ideal for garden edging, groundcover, cottage gardens, city gardens or rock gardens. Best planted in groups of 5 to 10
  • Easy to grow, virtually disease free. Keep an eye out for slugs.
  • Propagate by seed by seed sown in spring in containers in an open cold frame or by careful division of mature clumps in early spring.
  • Native to mountainous woods of Japan.

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Requirements

Hardiness 6 – 9
Heat Zones 6 – 9
Plant Type Perennials
Exposure Partial Sun, Shade
Season of Interest Spring (Late)
Summer (Early)
Height 1' – 2' (30cm – 60cm)
Spread 1' – 2' (30cm – 60cm)
Spacing 20" (50cm)
Water Needs Average
Maintenance Low
Soil Type Chalk, Loam, Sand
Soil pH Acid, Alkaline, Neutral
Soil Drainage Moist but Well-Drained
Characteristics Plant of Merit, Showy
Garden Uses Banks and Slopes, Ground Covers
Garden Styles Informal and Cottage

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By Norikazu, Shutterstock

While every effort has been made to describe these plants accurately, please keep in mind that height, bloom time, and color may differ in various climates. The description of these plants has been written based on numerous outside resources.


Requirements

Hardiness 6 – 9
Heat Zones 6 – 9
Plant Type Perennials
Exposure Partial Sun, Shade
Season of Interest Spring (Late)
Summer (Early)
Height 1' – 2' (30cm – 60cm)
Spread 1' – 2' (30cm – 60cm)
Spacing 20" (50cm)
Water Needs Average
Maintenance Low
Soil Type Chalk, Loam, Sand
Soil pH Acid, Alkaline, Neutral
Soil Drainage Moist but Well-Drained
Characteristics Plant of Merit, Showy
Garden Uses Banks and Slopes, Ground Covers
Garden Styles Informal and Cottage

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