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Herbaceous Perennial

Micranthes pensylvanica

swamp saxifrage

A basal rosette of leathery, oblong leaves up to 25cm long. In spring, stout stems up to 1m tall bear branched clusters of small, greenish-yellow flowers

Synonyms

Saxifraga pensylvanica

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Ultimate height

0.5–1 metres

Time to ultimate height

2–5 years

Ultimate spread

0.1–0.5 metres

Clay

Loam

Sand

Moisture

Poorly–drained

pH

Acid, Alkaline, Neutral

	Stem	Flower	Foliage	Fruit
Spring
Summer
Autumn
Winter

Full sun
Partial shade

Aspect

South–facing or East–facing or West–facing

Exposure

Exposed or 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)

Botanical details

Family: Saxifragaceae
Native to GB / Ireland: No
Foliage: Semi evergreen
Habit: Clump forming
Genus: A genus of herbaceous flowering plants native to north temperate arctic and alpine regions. Green or red basal foliage forms low-growing rosettes and can be straight-edged or serrated. Delicate, star-shaped white flowers appear on upright stems in the summer
Name status: Correct
Plant range: E North America

How to grow

Cultivation

Grows best in partial shade in wet soils; suitble for boggy ground and pond margins

Propagation

Propagate by seed

Suggested planting locations and garden types

Cottage and informal garden
Low Maintenance

Pruning

No pruning required

Pests

Generally pest-free

Diseases

Generally disease-free

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