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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 frogbit
Family Hydrocharitaceae
Genus Hydrocharis can be submerged or floating aquatic perennials with glossy, rounded leaves and white, 3-petalled flowers in summer
Details H. morsus-ranae is a floating aquatic perennial with rounded leaves 3cm across, and white flowers 2-3cm across, with a yellow spot on each petal
Foliage Deciduous
Habit Floating
Hardiness
All ratings refer to the UK growing conditions unless otherwise stated. Minimum temperature ranges (in degrees C) are shown in brackets
H5
Full Sun
Aspect South-facing or West-facing
Exposure Exposed or Sheltered
Chalk
Clay
Loam
Sand
MoisturePoorly-drained
SoilChalk, Clay, Loam, Sand
pHAlkaline
Ultimate height Up to 10 cm
Ultimate spread 0.5-1 metres
Time to ultimate height 5-10 years
Cultivation Grow in still, alkaline water in full sun. Water must be deep enough to prevent bottom freezing to protect overwintering buds
Propagation Propagate by seed or division of stolons
Suggested planting locations and garden types Low Maintenance
Pruning No pruning required
Pests Leaves may be eaten by water snails, liable to attack by the larvae of the brown china-mark moth
Diseases Generally disease free
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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.