Magnolia kobus 'Janaki Ammal'

RHS Plant Profile

magnolia 'Janaki Ammal'

Trees

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A mid-sized deciduous tree, to around 5m high in 10 years, and up to 10m high at maturity. It has an upright then spreading habit, and long, slightly wavy glossy green leaves. Mature trees produce masses of large, cup-shaped flowers as the leaves emerge in spring, followed by clusters of bright red seeds in autumn. This cultivar was named after a pioneering female botanist

Position

Full sun, Partial shade

Soil Types

Clay, Loam, Sand

Max Height

8-12 metres

Max Spread

4-8 metres

Size

Time to Maturity: 20–50 years
Max Spread: 4-8 metres
Max Height: 8-12 metres

Growing Conditions

Clay Loam Sand

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

Position

Full sun Partial shade

Aspect: South–facing or West–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): H6

Colour & Scent

Season	Stem	Flower	Foliage	Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family: Magnoliaceae
Native to GB/Ireland: No
Foliage: Deciduous
Habit: Columnar upright, Spreading branched
Genus: Magnolia can be deciduous or evergreen trees or shrubs, with large, showy, often fragrant flowers, often opening before the leaves, and sometimes followed by colourful cone-like fruit
Name Status: Accepted

How to Grow

Cultivation

Thrives in moist but well-drained, neutral to acid soil, though this species will tolerate slightly alkaline soils as long as they are not too dry. Position in full sun or part shade with shelter from cold winds. Late frosts may damage flower buds. See magnolia cultivation for more advice

Propagation

Propagate by softwood cuttings in early summer or by semi-ripe cuttings in late summer

Suggested planting locations and garden types

Architectural

Pruning

Minimal pruning required, see pruning group 1. Deciduous magnolias should only be pruned between midsummer and early autumn

Pests

May be susceptible to scale insects, horse chestnut scale and capsid bug

Diseases

May be susceptible to coral spot, phytophthora, grey moulds, honey fungus, a virus or fungal leaf spot