Overview
Iris macrosiphon is a upright herbaceous perennial in the genus Iris, part of the Iridaceae family, with blue-green foliage. It typically grows 0–0.01 metres wide. Iris macrosiphon 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
The leaves are very slender, 2.5–5 mm wide, and blue-green in color. The flower is variable, golden yellow to cream or pale lavender to deep blue-purple, generally with darker veins. The flower stems are usually short (less than 25 cm) when in the sun and bear 2 flowers. It is native to North America and California. In the garden it prefers full sun and sandy soil. In UK gardens it is fully hardy throughout the UK (RHS H7). Suggested uses include border planting and architectural plant. It tolerates neutral soils, dry conditions and south-facing aspects. Grow in well-drained, fertile soil in full sun. Plant rhizomes shallowly with the top exposed to the sun. Water during dry spells but avoid waterlogging.
Wikipedia contributors, CC BY-SA 4.0 — Iris macrosiphon
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
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 macrosiphon size, habit and characteristics
- Plant type
- Herbaceous Perennial
- Habit
- Upright
- Foliage
- Blue-green
- Spread
- 0–0.01 metres
- Suggested uses
- Border planting, Architectural plant
Care notes
Pruning and caring for Iris macrosiphon
- Propagation
- Division, Seed
- Pest resistance
- Resistant
- Disease resistance
- Resistant
Frequently asked questions
Where is the best place to plant Iris macrosiphon?
Iris macrosiphon prefers full sun. It suits sheltered positions.
What soil does Iris macrosiphon need?
Iris macrosiphon grows best in sandy soil. It prefers neutral soil. Aim for soil that stays dry.
How big does Iris macrosiphon grow?
Iris macrosiphon reaches a spread of 0–0.01 metres.
Is Iris macrosiphon hardy in the UK?
Iris macrosiphon 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 macrosiphon?
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)