Hemerocallis 'Isis' (Daylily) — Clump-forming, arching foliage with upright scapes

Overview

Hemerocallis 'Isis' is a clump-forming, arching foliage with upright scapes perennial in the genus Hemerocallis, part of the Asphodelaceae family, with deciduous or semi-evergreen; arching, strap-shaped, fresh green foliage. Hemerocallis 'Isis' grows best in full sun to partial shade; darker colours hold better out of hot sun, and tolerates almost any reasonable soil and from loam to clay soils and acid and neutral or alkaline pH. Its UK hardiness is rated H6-H7. Suggested uses include borders, mass planting, containers and cut flowers.

About

Hemerocallis 'Isis' is a clump-forming perennial daylily with arching, strap-shaped leaves and upright flower scapes. It bears mildly fragrant blooms from June to August. The foliage is fresh green and may be deciduous or semi-evergreen depending on site. Grow in full sun to partial shade; darker flower tones keep better out of hot sun.

About the genus

A daylily, day lily or ditch-lily is a flowering plant in the genus Hemerocallis, a member of the family Asphodelaceae, subfamily Hemerocallidoideae, native to Asia. Despite the common name, it is not taxonomically classified in the lily genus. Gardening enthusiasts and horticulturists have long bred Hemerocallis species for their attractive flowers; a select few species of the genus have edible petals, while some are extremely toxic.

Wikipedia contributors, "Daylily", CC BY-SA 4.0 — Daylily

In the garden

Hemerocallis 'Isis' is a clump-forming perennial in the genus Hemerocallis, producing arching, strap-shaped leaves from a central crown and upright scapes that carry the flowers. The blooms are mildly fragrant and appear in the UK from June to August, rising clear of the foliage to make them easy to pick for arranging. Plant 'Isis' in a position that receives full sun or partial shade; note that darker flower colours retain their intensity better when sheltered from the hottest afternoon sun. It will tolerate almost any reasonable soil from loam to heavy clay and accepts acid, neutral or alkaline pH. Prefer moist but well drained soil, though established clumps will cope with both damp and drier periods. Aspect is flexible and the plant will perform in exposed or sheltered sites. With a UK hardiness rating of H6–H7, it is very hardy to fully hardy in typical British gardens. Use Hemerocallis 'Isis' in mixed borders where the arching foliage provides a fountain-like base for the upright scapes, in mass plantings for summer impact, in containers or as a source of cut flowers. The upright scapes rise above the arching, strap-shaped leaves and carry the lightly scented flowers through June to August.

Growing conditions

Best soil and position for Hemerocallis

Sunlight: Full sun to partial shade; darker colours hold better out of hot sun
Soil type: Almost any reasonable soil, from loam to clay
Soil pH: Acid, neutral or alkaline
Soil moisture: Moist but well drained; tolerates both damp and dry once established
Aspect: Any
Exposure: Exposed or sheltered
UK hardiness: H6-H7

Plant details

Hemerocallis 'Isis' size, habit and characteristics

Plant type: Perennial
Habit: Clump-forming, arching foliage with upright scapes
Foliage: Deciduous or semi-evergreen; arching, strap-shaped, fresh green
Suggested uses: Borders, mass planting, containers, cut flowers
Fragrance: Mild fragrance

Care notes

Pruning and caring for Hemerocallis 'Isis'

Cultivation: Among the most forgiving of perennials, and effectively unkillable once settled. They flower most freely in an open position with reasonable moisture while the buds are forming, and benefit from division every four or five years, since a congested clump produces plenty of leaf and progressively fewer scapes.
Pruning: Snap off spent blooms to keep the display clean, and cut scapes to the base once all buds have finished. Remove dead foliage in late autumn or early spring.
Propagation: Divide in early spring or immediately after flowering, splitting the crown into fans each with roots attached. Proliferations that form on the scapes of some cultivars can be rooted as cuttings.
Pest resistance: Slugs and snails graze new spring growth, and hemerocallis gall midge distorts buds in early summer - affected buds are best picked off and destroyed.
Disease resistance: Robust. Daylily rust is the main disease of note but remains uncommon in the UK.

Frequently asked questions

How do I grow Hemerocallis 'Isis'?

Among the most forgiving of perennials, and effectively unkillable once settled. They flower most freely in an open position with reasonable moisture while the buds are forming, and benefit from division every four or five years, since a congested clump produces plenty of leaf and progressively fewer scapes.

Where is the best place to plant Hemerocallis 'Isis'?

Hemerocallis 'Isis' prefers full sun to partial shade; darker colours hold better out of hot sun. It suits exposed or sheltered positions.

What soil does Hemerocallis 'Isis' need?

Hemerocallis 'Isis' grows best in almost any reasonable soil and from loam to clay soil. It prefers acid and neutral or alkaline soil. Aim for soil that stays moist but well drained; tolerates both damp and dry once established.

How do I prune Hemerocallis 'Isis'?

Snap off spent blooms to keep the display clean, and cut scapes to the base once all buds have finished. Remove dead foliage in late autumn or early spring.

Is Hemerocallis 'Isis' hardy in the UK?

Hemerocallis 'Isis' has an RHS hardiness rating of H6, meaning it is very hardy, tolerating -20 to -15°C across most of the UK.

How do I propagate Hemerocallis 'Isis'?

Divide in early spring or immediately after flowering, splitting the crown into fans each with roots attached. Proliferations that form on the scapes of some cultivars can be rooted as cuttings.

More in the Hemerocallis genus

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