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Lagarosiphon major

curly waterweed

This plant is listed on Schedule 9 of the UK Wildlife & Countryside Act as an invasive, non-native species and is banned from sale. See cultivation notes for further details A submerged perennial with close-set, recurved, dark green leaves and small tubular pinkish flowers in summer

Other common names
curly water thyme
giant water thyme
Synonyms
Elodea crispa
Size
Ultimate height
Up to 10cm
Time to ultimate height
5–10 years
Ultimate spread
0.5–1 metres
Growing conditions
Loam
Moisture
Poorly–drained
pH
Acid, Alkaline, Neutral
Colour & scent
StemFlowerFoliageFruit
Spring Green
Summer Green Pink Green
Autumn Green
Winter Green
Position
  • Full sun
Aspect

South–facing or East–facing or West–facing

Exposure
Exposed or Sheltered
Hardiness
H5
Botanical details
Family
Hydrocharitaceae
Native to the UK
No
Foliage
Semi evergreen
Habit
Submerged
Genus

Lagarosiphon are semi-evergreen, submerged aquatic perennials forming a cluster of branched stems clothed in spirally arranged, linear-lanceolate leaves, and tiny white or pink flowers in summer

Name status

Correct

How to grow

Cultivation

This plant is listed on Schedule 9 of the UK Wildlife & Countryside Act as an invasive non-native species. Across the EU, UK and NI it is an offence to plant or cause to grow in the wild plants listed on Schedule 9 of this order. These plants should not be planted or caused to grow in the wild and in addition are banned from sale. Gardeners possessing them should undertake measures to control them. See RHS advice on invasive non-native species for further information

Propagation

See cultivation notes

Suggested planting locations and garden types

Get involved

The Royal Horticultural Society is the UK’s leading gardening charity. We aim to enrich everyone’s life through plants, and make the UK a greener and more beautiful place.