Iris 'Helen McGregor' (TB) — Upright

Overview

Iris 'Helen McGregor' (TB) is a upright herbaceous perennial in the genus Iris, part of the Iridaceae family, with blue-green foliage. Iris 'Helen McGregor' (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 'Helen McGregor' is a herbaceous perennial in the Iridaceae with an upright habit and distinct blue-green foliage. It is cultivated for border planting and as an architectural plant, producing flowers from May to July. Plant in a south-facing, sheltered spot in full sun on dry, sandy, neutral soil. It is fully hardy in the UK (H7).

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 'Helen McGregor' is a cultivated selection within the Iridaceae, grown as an architectural, upright perennial with blue-green foliage and a clear seasonal flowering window from May to July. As a herbaceous perennial it dies back after the season and re-emerges from its rootstock the following year, and is used where strong vertical form is required in the border. Position it in full sun on a south-facing, sheltered site and choose a sandy, neutral soil that remains dry rather than waterlogged; these conditions best match its tolerance and help prevent basal rot. The plant's H7 hardiness means it will withstand UK winter conditions without additional winter protection, but it still prefers a free-draining spot rather than heavy, moisture-retentive ground. Use Iris 'Helen McGregor' as a structural element in mixed perennial borders or as a focused architectural accent. Its upright fans of blue-green leaves provide a durable backdrop to neighbouring plants, and the flowering period from May to July gives a concentrated early-summer display. Expect the foliage fans to hold the flower stems upright and deliver a steady vertical presence through the May to July flowering.

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 'Helen McGregor' (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 'Helen McGregor' (TB)

Propagation: Division, Seed
Pest resistance: Resistant
Disease resistance: Resistant

Frequently asked questions

Where is the best place to plant Iris 'Helen McGregor' (TB)?

Iris 'Helen McGregor' (TB) prefers full sun. It suits sheltered positions.

What soil does Iris 'Helen McGregor' (TB) need?

Iris 'Helen McGregor' (TB) grows best in sandy soil. It prefers neutral soil. Aim for soil that stays dry.

Is Iris 'Helen McGregor' (TB) hardy in the UK?

Iris 'Helen McGregor' (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 'Helen McGregor' (TB)?

Division, Seed.

More in the Iris genus

Browse all Iris →