Overview
Stylophorum diphyllum is a plant with a herbaceous perennial habit in the genus Stylophorum, part of the Papaveraceae family, with deeply divided leaves foliage. Stylophorum diphyllum grows best in partial shade and full shade, and tolerates loam soils and any pH. Its UK hardiness is rated H5. Suggested uses include woodland garden, shady border and groundcover. It is native to Ontario.
About
Stylophorum diphyllum is an herbaceous perennial in the poppy family with deeply divided leaves and a spring flowering habit. It produces deep yellow blooms in April to May. Suited to sheltered, shady spots on moist loamy soil.
About the genus
Stylophorum (celandine-poppy) is a genus of three species of herbaceous perennial plants native to woodland in eastern North America and China.
Wikipedia contributors, "Stylophorum", CC BY-SA 4.0 — Stylophorum
In the garden
Stylophorum diphyllum is an herbaceous perennial in the Papaveraceae, native to Ontario. It carries deeply divided leaves and produces deep yellow flowers in April to May, providing a short, concentrated display on the woodland floor. Give it partial to full shade on a loam-based soil that stays moist but drains freely; it tolerates acid, neutral and alkaline pH. Sitings on north-, east- or west-facing aspects are appropriate, and a sheltered position will reduce winter desiccation. It is rated H5 in UK terms, meaning it is classed as hardy across much of the country when placed out of driving wind and kept out of drought-prone ground. Use Stylophorum diphyllum in a woodland garden, shady border or as a ground cover beneath trees and shrubs where leaf litter and dappled light replicate its natural setting. The April to May flowering window is short but distinct, so planting it where the flowers can be seen at close range makes the most of its seasonality.
Growing conditions
Best soil and position for Stylophorum
- Sunlight
- Partial shade, Full shade
- Soil type
- Loam
- Soil pH
- Acid, Alkaline, Neutral
- Soil moisture
- Moist but well-drained
- Aspect
- North-facing, East-facing, West-facing
- Exposure
- Sheltered
- UK hardiness
- H5
Plant details
Stylophorum diphyllum size, habit and characteristics
- Habit
- Herbaceous perennial
- Foliage
- Deeply divided leaves
- Suggested uses
- Woodland garden, Shady border, Groundcover
- Native to
- Ontario
Care notes
Pruning and caring for Stylophorum diphyllum
- Propagation
- Divide in spring, Sow seed in containers in fall
- Pest resistance
- Slugs, Snails
- Disease resistance
- Generally disease-free
Frequently asked questions
Where is the best place to plant Stylophorum diphyllum?
Stylophorum diphyllum prefers partial shade and full shade. It suits sheltered positions.
What soil does Stylophorum diphyllum need?
Stylophorum diphyllum grows best in loam soil. It is happy in soil of any pH. Aim for soil that stays moist but well-drained.
Is Stylophorum diphyllum hardy in the UK?
Stylophorum diphyllum has an RHS hardiness rating of H5, meaning it is hardy in most of the UK, tolerating -15 to -10°C.
How do I propagate Stylophorum diphyllum?
Divide in spring, Sow seed in containers in fall.
From the Fenn Plants journal
- Notes on DaffodilsWhen to plant daffodil bulbs in the UK, how deep, how to naturalise them in grass, why daffodils stop flowering (“blindness”), and why you should never mix cut daffodils with other flowers.
- Keeping Your NerveHow to garden through a heatwave — the best time to water, why deep soaks beat daily sprinkles, caring for pots and vulnerable plants, and why you can let the lawn go brown.
- Made to LastHow to clean, store and protect garden pots and planters — the frost-proof vs frost-resistant difference, winter care for terracotta and ceramic, and how to reuse a broken pot.