Fortune's saxifrage (Saxifraga fortunei)

Photo: Bentham-Moxon Trust.; Curtis, William; Curtis's botanical magazine dedications, 1827-1927 : portrait, Public domain · source

Perennial · Saxifragaceae

Fortune's saxifrage

Saxifraga fortunei

In other languages: Steenbreek (Nederlands) · Saxifrage de Fortune (Français)

Saxifraga fortunei comes from East Asia, including Japan and China, and is named after the Scottish plant collector Robert Fortune. Unlike most saxifrages, it flowers only in autumn, from September to November, with loose sprays of star-shaped white or pink flowers. The glossy, round to kidney-shaped, lobed leaves form an attractive, compact clump all season. It is a gem for the shade border, giving colour just when most plants have finished flowering.

  • Light

    Partial shade or shade

    tolerates little sun

  • Moisture

    Normal

    no wet feet

  • Legal basis

    Loam or clay

    acid to neutral

  • Hardiness

    Fully hardy

    down to -20 °C

  • Size

    0.3 m

    tall, 0.3 m wide

  • Flowering

    September–November

Key facts
Pruning monthsMarch
Height0.3 m
Native to BelgiumNo, planted
Good for bees, butterflies and birdsYes, for bees
Poisonous to people and petsNot known to be poisonous
FloweringSeptember–November

Identify

Fortune's saxifrage: how do you recognise it?

Habit
Compact clump about 30 cm tall and wide.
Foliage
Glossy, round to kidney-shaped, lobed with a toothed edge, on long leaf stalks.
Flower
Loose sprays of white or pink stars with five petals: the two lower petals are much longer than the others. From September to November.
Roots
Short rhizome with fibrous roots; it needs humus-rich, moist soil.

Flowering: September–November · Plants: March–May and September · Pruning: March

In your garden

Why grow it?

  • Flowers from September to November, when most shade plants have finished.
  • Glossy, elegant foliage that stays attractive all season.
  • Compact clump of about 30 cm: ideal for small shade borders and at the foot of shrubs.
  • The late flowers are a food source for bees.
  • Hardy enough for Belgian gardens (to about −20 °C).

Fortune's saxifrage: where does it grow best?

  • Partial shade to shade; sheltered from cold wind and early frost.
  • Humus-rich, moisture-retentive soil: loam or clay, acid to neutral.
  • Moderately moist; do not let it dry out in summer.
  • Allow 30 cm per plant.
Light
Partial shade and shade
Soil type
Loam or clay
Acidity
Acid or neutral
Moisture
Normal
Size
0.3 m tall, 0.3 m wide
Hardiness
Hardy (to -20 °C)

Goes well with

  • Autumn cyclamen: Flowers in the same autumn shade; small flowers above low leaves.
  • Japanese anemone: A late flowerer that tolerates the same partial shade.
  • Ferns: A fresh, green shade planting.
  • Hosta: Large leaves that contrast with the small stars.

Maintenance

Fortune's saxifrage: when and how to plant it?

Plant in March–May and September.

  1. Plant in March–May or in September, when the soil is not frozen or waterlogged.
  2. Mix a few spadefuls of compost or leaf mould into the soil of the planting hole.
  3. Set the plant at the same depth as in its pot, with the crown at soil level.
  4. Leave 30 cm between plants.
  5. Water thoroughly straight away and keep the soil moist in the first year.
  6. Spread a layer of leaf mould around the plant as mulch.

Care

Water
Keep the soil moist; water generously at the base in dry summers.
Feeding
A layer of compost in spring is enough.
Mulching
A layer of leaf mould in spring keeps the soil moist; an extra layer in November protects against frost.
Slugs
Protect the young leaves in spring; slugs love the soft shoots.
Tidying
In March remove dried leaves and spent flower stems.

Tip: Plant it in a sheltered shady spot with humus-rich soil: the late flowers colour the autumn. Protect it from slugs in spring.

Fortune's saxifrage: when to prune it?

Pruning months: March.

When: In March, before the new leaves come through.

How:

  • It is hardly pruned: only cut away dead leaves and spent flower stems.
  • Do not cut healthy green foliage; it is the beauty of the plant.
  • Use sharp secateurs and clear away the clippings.

Pruning: when and how · Pruning calendar and basic rules

Propagation

Division
In March–April, divide the clump with a spade into pieces with roots and shoots, and replant at once.
Seed
In spring, scatter the fine seed on the surface and barely cover it; keep the soil moist.

Fortune's saxifrage: how does it get through the winter?

Hardy to −20 °C.

  • Hardy to about −20 °C: light protection is enough in Belgian winters.
  • In November, cover the clump with a layer of leaves or compost. In hard frost the foliage may shrivel; it grows back in spring.
  • In a pot: stand it against a wall, or move it to a bright, frost-free place in hard frost.

Diseases and pests

  • Slugs: They eat young leaves in spring. Collect them in the evening and protect the plants.
  • Vine weevil: The grubs eat the roots: the plant wilts and comes loose. Biological nematodes in the soil help.
  • Frost damage to flowers: Late flowers can freeze on a cold November night. Choose a sheltered spot.
  • Drought: Leaf edges turn brown. Water generously and mulch the soil.

Through the year

  • March: Cut away dead leaves and spent stems. Plant or divide.
  • April: Plant or divide. Watch for slugs.
  • May: Plant. Apply mulch. Watch for slugs.
  • June: Water in dry weather.
  • July: Water in dry weather.
  • August: Keep the soil moist; flower buds form.
  • September: Flowering begins. Plant.
  • October: Full flower.
  • November: Last flowers. Protective layer of leaves or compost.
  • December: Dormant.

Use

Good for wildlife

Bees
Nectar and pollen for honeybees and wild bees.

You and this species

Did you know?

  • Robert Fortune (1812–1880) collected plants in China and Japan and, among other things, took tea plants from China to India.
  • The flowers are asymmetrical: the two lower petals are much longer than the three upper ones.

Garden plants · All species

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