Hymenocallis × macrostephana

RHS Plant Profile

day lily

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Bulbs Conservatory Greenhouse

A bulbous perennial with bright green strap-shaped leaves and erect stems to 75cm in height, bearing up to 10 fragrant white flowers, 15cm across, with a large, daffodil-like cup and narrow, curling petals

Position

Full sun, Partial shade

Soil Types

Chalk, Clay, Loam, Sand

Max Height

0.5-1 metres

Max Spread

0.1-0.5 metres

Size

Time to Maturity: 2–5 years
Max Spread: 0.1-0.5 metres
Max Height: 0.5-1 metres

Growing Conditions

Chalk Clay Loam Sand

Moisture: Moist but well–drained or Well–drained
pH: Acid or Alkaline or Neutral

Position

Full sun Partial shade

Aspect: West–facing or East–facing or South–facing or North–facing
Exposure: Sheltered
Hardiness

Hardiness Ratings

All ratings refer to the UK growing conditions unless otherwise stated. Minimum temperature ranges (in degrees C) are shown in brackets

H1A: under glass all year (>15C)
H1B: can be grown outside in the summer (10 - 15)
H1C: can be grown outside in the summer (5 - 10)
H2: tolerant of low temperatures, but not surviving being frozen (1 to 5)
H3: hardy in coastal and relatively mild parts of the UK (-5 to 1)
H4: hardy through most of the UK (-10 to -5)
H5: hardy in most places throughout the UK even in severe winters (-15 to -10)
H6: hardy in all of UK and northern Europe (-20 to -15)
H7: hardy in the severest European continental climates (< -20): H1C

Colour & Scent

Fragrance Flower

Season	Stem	Flower	Foliage	Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family: Amaryllidaceae
Native to GB/Ireland: No
Foliage: Deciduous
Habit: Tufted
Potentially harmful: Ornamental bulbs - not to be eaten. Wear gloves and other protective equipment when handling Pets: Ornamental bulbs - not to be eaten - see the HTA guide to potentially harmful plants for further information and useful contact numbers
Genus: Hymenocallis are bulbous perennials, sometimes evergreen, with strap-shaped leaves and umbels of fragrant, daffodil-like flowers with a cup and narrow, spreading tepals
Name Status: Correct

How to Grow

Cultivation

Plant bulbs with the neck and shoulder just above the surface, when dormant, in moderately fertile soil. Under glass grow in a peat-free, loam-based potting compost with added leaf mould and grit in full light. Water freely when in growth and apply a balanced liquid, dilute fertiliser every fortnight. Keep dry when dormant

Propagation

Propagate by seed at 19 to 24°C as soon as ripe or remove offsets in spring

Suggested planting locations and garden types

Patio and container plants
Low Maintenance

Pruning

No pruning required

Pests

Generally pest-free

Diseases

Generally disease-free