Iris 'Saint Crispin' (TB)

RHS Plant Profile

tall bearded iris 'Saint Crispin'

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A clump-forming, rhizomatous herbaceous perennial with sword-shaped green leaves and large, fragrant, ruffled golden yellow to dark gold flowers with bright orange beards appearing May to June

Max Height

0.5-1 metres

Max Spread

0.1-0.5 metres

Size

Max Spread: 0.1-0.5 metres
Max Height: 0.5-1 metres

Botanical Details

Family: Iridaceae
Native to GB/Ireland: No
Potentially harmful: Harmfulifeaten.Wearglovesandotherprotectiveequipmentwhenhandling.Pets:Harmfulifeaten.Forfurtherinformationandcontactnumbersregardingpets,seetheHTAguidetopotentiallyharmfulplants
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
Name Status: Unresolved
Horticultural Group

Horticultural Classification Codes

Horticultural Classification Codes are often given to genera which have a large number of species or cultivars. They are used to categorise cultivated plants based on specific, shared characteristics such as shape, colour, size or flowering time, and can be displayed as letters or numbers

For example:
Dahlia ‘Sunset Kate (Sin) = Single flower
Rosa ‘Marigold’ (HT) = Hybrid Tea: Tall Bearded irises are herbaceous rhizomatous perennials to 70cm or more, with flowers 10-20cm across, bearded on the falls, in late spring and early summer

How to Grow

Cultivation

Grow in well-drained, fertile, neutral to slightly acidic soil in full sun. Do not cover the rhizomes with mulch, or allow other plants to shade them; sun on the rhizomes encourages flowering. Give a high potash feed in spring and divide every three to four years. See also bearded iris cultivation

Propagation

Propagate by division of rhizomes from midsummer to early autumn, see dividing irises

Pruning

Remove any dying foliage in autumn, old flower stems can be cut down after flowering

Pests

May be susceptible to slugs and snails

Diseases

May be susceptible to aphid-borne viruses, bacterial soft rot and grey moulds; see Iris diseases