Hosta fortunei 'Obscura Marginata' (Plantain Lily) — Clump-forming, mounded

Overview

Hosta fortunei 'Obscura Marginata' is a clump-forming, mounded perennial in the genus Hosta, part of the Asparagaceae family, with deciduous; broad, ribbed or puckered, often variegated or glaucous foliage. Hosta fortunei 'Obscura Marginata' grows best in partial to full shade; blue-leaved kinds hold their colour best out of sun, and tolerates fertile loam enriched with organic matter soils and neutral to slightly acid pH. Its UK hardiness is rated H7.

About

Hosta fortunei 'Obscura Marginata' is a clump-forming, mounded perennial in the genus Hosta, grown for its broad, ribbed leaves that are often variegated. The foliage is deciduous and the plant sends up flower scapes in June to August. It prefers partial to full shade on north- or east-facing, sheltered sites and does best in fertile loam enriched with organic matter. Fully hardy (H7; USDA 3–9), it needs reliably moist but never waterlogged soil.

Wikipedia contributors, CC BY-SA 4.0 — Hosta sieboldiana

About the genus

Hosta is a genus of plants commonly known as hostas, plantain lilies and occasionally by the Japanese name gibōshi. Hostas are widely cultivated as shade-tolerant foliage plants. The genus is placed in the family Asparagaceae, subfamily Agavoideae, and is native to northeast Asia.

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

In the garden

A cultivar within the genus Hosta, Hosta fortunei 'Obscura Marginata' is selected primarily for its broad, ribbed leaves, which are frequently variegated or glaucous in appearance. It is deciduous and produces flowering scapes in June to August that rise above the foliage, adding a seasonal vertical element. Plants sit in a clump-forming, mounded habit and are treated as perennial herbaceous subjects in temperate gardens. Position this cultivar in partial to full shade; north or east aspects suit it best and a sheltered location reduces leaf scorch and wind damage. Blue-leaved types in the genus hold their colour better out of strong sun, so avoid hot, exposed sites. Use a fertile loam enriched with plenty of organic matter, maintain neutral to slightly acid soil pH, and keep soil reliably moist but not waterlogged to prevent crown and root issues. Hardiness is H7, meaning it tolerates severe UK winter conditions (USDA 3–9). Use Hosta fortunei 'Obscura Marginata' in shaded mixed borders, beneath larger shrubs or trees where soil remains cool, or grouped as a ground cover to form a steady mound of foliage. Expect fresh shoots each spring that develop into the cultivar's characteristic mounded clump, while the summer scapes offer a clear seasonal marker for June to August.

Growing conditions

Best soil and position for Hosta

Sunlight: Partial to full shade; blue-leaved kinds hold their colour best out of sun
Soil type: Fertile loam enriched with organic matter
Soil pH: Neutral to slightly acid
Soil moisture: Reliably moist but never waterlogged
Aspect: North or east facing
Exposure: Sheltered
UK hardiness: H7

Plant details

Hosta fortunei 'Obscura Marginata' size, habit and characteristics

Plant type: Perennial
Habit: Clump-forming, mounded
Foliage: Deciduous; broad, ribbed or puckered, often variegated or glaucous

Care notes

Pruning and caring for Hosta fortunei 'Obscura Marginata'

Cultivation: Give a cool root run, generous leaf mould and consistent moisture — drought is what produces thin, scorched leaves. Growing in containers makes slug control far easier, and a top-dressing of grit or a copper band around the pot helps further.
Pruning: No pruning needed. Remove flower scapes once faded if seed is not wanted, and clear collapsed foliage in late autumn to take away slug shelter.
Propagation: Divide crowns in early spring as the shoots emerge, cutting between the buds with a sharp knife. Division is the only way to keep a named cultivar true.
Pest resistance: Highly attractive to slugs and snails, which is the one real limiting factor; vine weevil can be serious in containers.
Disease resistance: Generally healthy. Hosta virus X is the notable exception — affected plants should be destroyed rather than divided.

Frequently asked questions

How do I grow Hosta fortunei 'Obscura Marginata'?

Give a cool root run, generous leaf mould and consistent moisture — drought is what produces thin, scorched leaves. Growing in containers makes slug control far easier, and a top-dressing of grit or a copper band around the pot helps further.

Where is the best place to plant Hosta fortunei 'Obscura Marginata'?

Hosta fortunei 'Obscura Marginata' prefers partial to full shade; blue-leaved kinds hold their colour best out of sun. It suits sheltered positions.

What soil does Hosta fortunei 'Obscura Marginata' need?

Hosta fortunei 'Obscura Marginata' grows best in fertile loam enriched with organic matter soil. It prefers neutral to slightly acid soil. Aim for soil that stays reliably moist but never waterlogged.

How do I prune Hosta fortunei 'Obscura Marginata'?

No pruning needed. Remove flower scapes once faded if seed is not wanted, and clear collapsed foliage in late autumn to take away slug shelter.

Is Hosta fortunei 'Obscura Marginata' hardy in the UK?

Hosta fortunei 'Obscura Marginata' has an RHS hardiness rating of H7, meaning it is fully hardy throughout the UK, tolerating temperatures below -20°C.

How do I propagate Hosta fortunei 'Obscura Marginata'?

Divide crowns in early spring as the shoots emerge, cutting between the buds with a sharp knife. Division is the only way to keep a named cultivar true.

More in the Hosta genus

Browse all Hosta →