Overview
Iris 'Helene C.' (TB) is a upright herbaceous perennial in the genus Iris, part of the Iridaceae family, with blue-green foliage. Iris 'Helene C.' (TB) grows best in full sun, and tolerates sandy soils and neutral pH. Its UK hardiness is rated H7. Suggested uses include border planting and architectural plant.
About
Iris 'Helene C.' is an upright herbaceous perennial in the iris family with blue-green foliage and an architectural presence. It flowers from May to July. Plant in a south-facing, sheltered spot in sandy, neutral soil that remains on the dry side; it is fully hardy (H7) across the UK.
About the genus
Iris takes its name from the Greek goddess of the rainbow, and for once the naming feels entirely earned. I can't think of another genus that covers so much ground — inky purples, burnt apricots, clean whites, blues that seem lit from inside — or so many situations. There are bearded irises that want their rhizomes baked in full sun, Siberian types happy in ordinary border soil, and species that will sit contentedly at the edge of a pond. What they share is the flower: three petals standing up, three falling away, built with a kind of architectural confidence most plants never attempt. Even out of bloom the foliage earns its place — those upright fans of blue-green leaves hold a border together for months. I grow them for the fortnight in May and June when nothing else in the garden can compete, and I've made my peace with that. Some plants are for the long haul. An iris is an event.
Written by Henry
In the garden
Iris 'Helene C.' sits within the Iridaceae as a herbaceous perennial with an upright habit and blue-green leaves, providing a clear vertical element through late spring. Its flowering period runs from May to July, giving a concentrated display while nearby perennials are still coming into leaf. Position this iris in full sun on a south-facing, sheltered site where the soil is sandy, neutral and free-draining. The plant prefers dry conditions rather than wet ground, so avoid waterlogged locations; good drainage is more important than rich soil. The UK hardiness rating H7 denotes that it is fully hardy and will tolerate typical winter conditions when sited appropriately. Use Iris 'Helene C.' where structure is needed: as an architectural accent in mixed borders or as a vertical foil in linear beds. Its blue-green foliage holds form before and after flowering, making it suitable for border planting where contrast with lower-growing companions is required. Sit it where the upright leaves can be seen against a backdrop, and plan for its May–July flowers to carry the spring sequence before summer perennials take over.
Growing conditions
Best soil and position for Iris
- Sunlight
- Full sun
- Soil type
- Sandy
- Soil pH
- Neutral
- Soil moisture
- Dry
- Aspect
- South-facing
- Exposure
- Sheltered
- UK hardiness
- H7
Plant details
Iris 'Helene C.' (TB) size, habit and characteristics
- Plant type
- Herbaceous Perennial
- Habit
- Upright
- Foliage
- Blue-green
- Suggested uses
- Border planting, Architectural plant
Care notes
Pruning and caring for Iris 'Helene C.' (TB)
- Propagation
- Division, Seed
- Pest resistance
- Resistant
- Disease resistance
- Resistant
Frequently asked questions
Where is the best place to plant Iris 'Helene C.' (TB)?
Iris 'Helene C.' (TB) prefers full sun. It suits sheltered positions.
What soil does Iris 'Helene C.' (TB) need?
Iris 'Helene C.' (TB) grows best in sandy soil. It prefers neutral soil. Aim for soil that stays dry.
Is Iris 'Helene C.' (TB) hardy in the UK?
Iris 'Helene C.' (TB) has an RHS hardiness rating of H7, meaning it is fully hardy throughout the UK, tolerating temperatures below -20°C.
How do I propagate Iris 'Helene C.' (TB)?
Division, Seed.
More in the Iris genus
- Iris 'Antigone' (TB)
- Iris 'Dauntless' (TB)
- Iris 'Dipped in Dots' (TB)
- Iris 'Ablaze' (MDB)
- Iris 'After the Storm' (TB)
- Iris 'Aldo Ratti' (TB)
- Iris 'Alene's New Love' (SDB)iris 'Alene's New Love'
- Iris 'Alpine Lake' (MDB)