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AGM plants have been through a rigorous trial and assessment programme. They are:
This plant will provide nectar and pollen for bees and the many other types of pollinating insects.
It is included in an evolving list of plants carefully researched and chosen by RHS experts. Divided into 3 groups these lists, linked below, are maintained by a team of RHS staff and are reviewed annually.
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Other common names common water starwort
Synonyms Callitriche verna subsp. stagnalis
Family Plantaginaceae
Genus Callitriche can be terrestrial or aquatic perennials with slender stems bearing linear or spoon-shaped leaves and minute flowers in summer, useful oxygenating plants for ponds
Details C. stagnalis is an aquatic plant with spoon-shaped, bright green submerged leaves to 2cm long, and rosettes of broader floating leaves. Stems often root into wet mud to form a close mat; flowers insignificant
Plant range S Europe, N Afr.
Foliage Deciduous
Habit Mat forming
Hardiness
All ratings refer to the UK growing conditions unless otherwise stated. Minimum temperature ranges (in degrees C) are shown in brackets
H4
Full Sun
Partial Shade
Aspect South-facing or East-facing or West-facing
Exposure Sheltered
Loam
MoisturePoorly-drained
SoilLoam
pHAcid, Alkaline, Neutral
Ultimate height Up to 10 cm
Ultimate spread 0.1-0.5 metres
Time to ultimate height 1-2 years
Cultivation Plant in ponds and streams at a depth of between 15cm-60cm (6in- 2ft)
Propagation Propagate by division or stem cuttings made in summer
Suggested planting locations and garden types Wildlife Gardens
Pruning Limit spread as necessary
Pests Generally pest free
Diseases Generally disease free
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