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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 yellow iris daggers
flagon Jacob's sword water flag water skegs yellow flag yellow fleur-de-lis
Family Iridaceae
Genus Iris may be rhizomatous or bulbous perennials, with narrow leaves and erect stems bearing flowers with 3 large spreading or pendent fall petals, alternating with 3 erect, often smaller, standard petals, in late winter, spring or early summer
Details I. pseudacorus is a vigorous herbaceous perennial forming extensive colonies to 1.5m in height, with bright yellow flowers up to 10cm in width, the falls with brown veining in the centre, in mid and late summer
Plant range Europe Africa Asia
Foliage Deciduous
Habit Suckering
Toxicity Ingestion may cause severe discomfort. Wear gloves and wash hands after handling
Hardiness
All ratings refer to the UK growing conditions unless otherwise stated. Minimum temperature ranges (in degrees C) are shown in brackets
H7
Full Sun
Partial Shade
Aspect South-facing or East-facing
Exposure Exposed or Sheltered
Clay
Loam
MoisturePoorly-drained
SoilClay, Loam
pHAcid
Ultimate height 1-1.5 metres
Ultimate spread 1-1.5 metres
Time to ultimate height 2-5 years
Cultivation Grow in wet, deep, acid, humus-rich soil in full sun or partial shade. It thrives at the margins of large ponds or streams; vigorous so site with care
Propagation Propagate by division from midsummer to early autumn, plant immediately in flowering positions
Suggested planting locations and garden types Flower borders and beds Wall-side Borders Coastal Cottage & Informal Garden City & Courtyard Gardens
Pruning Remove any dying foliage in autumn, old flower stems can be cut down after flowering
Pests May be attacked by slugs, snails and thrips
Diseases Susceptible to aphid borne viruses, bacterial soft rot and Botrytis
RHS members can get exclusive individual advice from the RHS Gardening Advice team.
yellow iris
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