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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 gooseneck loosestrife gooseneck
Family Primulaceae
Genus Lysimachia are herbaceous or evergreen perennials with simple leaves and star-shaped, cupped or bowl-shaped flowers in terminal racemes or panicles, or solitary in leaf axils
Details Vigorous herbaceous perennial forming an extensive colony of erect stems to 1m in height, with narrow, greyish leaves. Small greyish-white flowers are borne in slender terminal spikes
Plant range China, Japan
Foliage Deciduous
Habit Spreading / Branched
Hardiness
All ratings refer to the UK growing conditions unless otherwise stated. Minimum temperature ranges (in degrees C) are shown in brackets
H6
Full Sun
Partial Shade
Aspect South-facing or West-facing or East-facing
Exposure Sheltered
Chalk
Clay
Loam
Sand
MoistureMoist but well-drained, Poorly-drained
SoilChalk, Clay, Loam, Sand
pHAcid, Alkaline, Neutral
Ultimate height 0.5-1 metres
Ultimate spread 0.5-1 metres
Time to ultimate height 2-5 years
Cultivation Grow in humus-rich, moist soil that does not dry out in summer. Site in full sun or partial shade and allow plenty of room as it can be invasive. May need support
Propagation Propagate by seed in pots outdoors spring or propagate by division in spring or autumn
Suggested planting locations and garden types Flower borders and beds Cottage & Informal Garden Wildlife Gardens
Pruning Cut back after flowering
Pests May be attacked by slugs and snails
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.