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Rhododendron 'Horizon Monarch'

Rhododendron

Soft yellow blooms touched with pink make Rhododendron 'Horizon Monarch' a gentle highlight for the late spring garden.

Supplied as an established plant in a 3 litre pot

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Aspect

Partial shade

Hardiness

Hardy in most parts of the UK when grown in a sheltered position

Flowers

May - June

Soil

Acidic loam, humus-rich soil

About this plant

  • Description

    A striking large-flowered rhododendron with red-pink buds that open to soft warm yellow blooms, lightly flushed and edged with pink. Its glossy evergreen foliage provides year-round structure, while the flowers bring a gentle glow to lightly shaded gardens in late spring.

  • Why we like it

    “

    Rhododendron 'Horizon Monarch' is a refined and dependable shrub that offers both beauty and structure. Its softly coloured flowers bring a more subtle, sophisticated palette to the garden, blending beautifully with other woodland plants. Combined with its evergreen foliage, it provides lasting value beyond the flowering season and works particularly well in shaded borders or as part of a layered planting scheme.

Specs & details

The particulars

Botanical name
Rhododendron 'Horizon Monarch'
Common name
Rhododendron
Supplied as
3 litre pot
Flowering period
May - June
Habit
Bushy spreading evergreen shrub
Hardiness
Hardy in most parts of the UK when grown in a sheltered position
Aspect
Partial shade
Soil type
Acidic loam, humus-rich soil
Moisture
Moist but well-drained
Position
Woodland border, sheltered shrub border, large patio container

Planting & care

Help it thrive

Planting guide

Plant in spring or autumn into humus-rich, acidic soil that is moist yet free-draining. Avoid alkaline or chalky soils. Choose a sheltered position with dappled or partial shade. Dig a wide planting hole, keeping the rootball level with the surrounding soil, and apply mulch after planting to support moisture retention and soil health.

Care tips

Keep the soil consistently moist, especially during dry periods and while the plant is establishing. Feed with an ericaceous fertiliser and mulch annually with acidic organic matter. Remove spent flower heads to maintain a tidy appearance and prune lightly after flowering if needed.

Winter care

Apply a mulch of leaf mould, composted bark or pine needles in autumn to retain moisture and maintain soil acidity. Provide shelter from cold winds and harsh early morning sun. Water during prolonged dry spells in winter if the soil is not frozen, especially for newly planted specimens.