Tanakaea radicans

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Japanese foam flower

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Herbaceous Perennial
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A compact evergreen perennial, to 10cm high, with spreading rhizomes and basal rosettes of oval to broadly lance-shaped, leathery green leaves with serrated edges. Slender stems bear sprays of tiny, densely packed star-shaped white flowers in late spring and early summer

Position

Full shade, Partial shade

Soil Types

Clay, Loam

Max Height

Up to 10 cm

Max Spread

0.1-0.5 metres

Size

Time to Maturity
2–5 years
Max Spread
0.1-0.5 metres
Max Height
Up to 10 cm

Growing Conditions

Clay Loam
Moisture
Moist but well–drained
pH
Acid or Alkaline or Neutral

Position

Full shade Partial shade
Aspect
West–facing or East–facing or North–facing
Exposure
Sheltered
Hardiness

Hardiness Ratings

All ratings refer to the UK growing conditions unless otherwise stated. Minimum temperature ranges (in degrees C) are shown in brackets

  • H1A: under glass all year (>15C)
  • H1B: can be grown outside in the summer (10 - 15)
  • H1C: can be grown outside in the summer (5 - 10)
  • H2: tolerant of low temperatures, but not surviving being frozen (1 to 5)
  • H3: hardy in coastal and relatively mild parts of the UK (-5 to 1)
  • H4: hardy through most of the UK (-10 to -5)
  • H5: hardy in most places throughout the UK even in severe winters (-15 to -10)
  • H6: hardy in all of UK and northern Europe (-20 to -15)
  • H7: hardy in the severest European continental climates (< -20)
H5

Colour & Scent

Season Stem Flower Foliage Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family
Saxifragaceae
Native to GB/Ireland
No
Foliage
Evergreen
Habit
Clump forming
Genus
Name Status
Correct

How to Grow

Cultivation

Grow in moist, humus-rich soil in full or partial shade, ideal for a woodland garden or a cool, shady corner of a rockery

Propagation

Propagate by division, separating rooted portions of rhizome in spring

Suggested planting locations and garden types

  • Cottage and informal garden
  • Rock garden
  • Flower borders and beds

Pruning

No pruning required

Pests

Generally pest-free

Diseases

Generally disease-free