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Rhododendron 'Horizon Monarch'

Evergreen Rhododendron

Hardy Shrub

What is Hardy Shrub?

Large, showy flowers

Around 15 blooms in a cluster

Low maintenance shrub or hedge

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Description How to Grow More Info Delivery

The red buds of Rhododendron ‘Horizon Monarch’ open into large, funnel-shaped blooms of a creamy-yellow shade flushed and backed with streaks of pinkish-red. The large flowers are held in impressive trusses, each composed of up to 15 blooms.

The subtle, creamy palette of this large-flowered Rhododendron provides a sophisticated alternative to brighter-coloured varieties. Its luminous blooms stand out beautifully against a background of dark green, leathery foliage. Rhododendron 'Horizon Monarch' makes a superb evergreen shrub for lighting up shady spots in acid, woodland-type borders. A reliable variety noted for its disease resistance, it has been recognised with an RHS Award of Garden Merit. Rhododendron ‘Horizon Monarch’ forms a dense, rounded shrub that is suitable for screening hedges or planted as a focal specimen. Long-lived, it provides colour from May to June for decades with little to no maintenance required. Height and spread: 1.8m (6 ft).

Plant height and spread is seasonal therefore we list by pot size rather than a defined plant size. The height and spread of the plant delivered will vary depending on the season, meaning arrival images are an indication only.

Height Up to 1.8m (6ft)
Spread Up to 1.8m (6ft)

Hardy Shrub

cottage gardenslow maintenance gardenspecimen plantwoodland garden

sun or semi shade

Flowering Months
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1 x 18 Litre Potted Plant (KF3322)
1 x 5 Litre Potted Plant (KF3323)

Grow Rhododendrons in moist, well drained, acid soil that has been enriched with plenty of well rotted organic matter. Choose a position in semi or dappled shade with shelter from cold drying winds. Many dwarf Rhododendrons can cope with a sunny position provided that the soil remains reliably moist. Where soil conditions are alkaline, Rhododendron plants are best grown in patio containers, using a mix of ericaceous compost and a soil based compost such as John Innes No. 3. Rhododendrons are surface rooting so it is important to avoid planting them too deeply.
Water Rhododendron plants regularly throughout the growing season. Where possible, use rainwater as the lime contained in tap water will reduce the acidity in the soil over time. Feed Rhododendrons in spring with a slow release fertiliser for acid-loving plants. Protect plants from cold winter winds. Border grown Rhododendrons will appreciate an autumn mulch to protect their shallow roots from winter cold. Take care not to mound the mulch too close to the stem as this may cause it to rot. If necessary, lightly prune Rhododendron plants in June to remove damaged shoots and restrict size.

Seeds and garden supplies will normally be delivered within the time period stated against each product as detailed above. Plants, bulbs, corms, tubers, shrubs, trees, potatoes, etc. are delivered at the appropriate time for planting or potting on. Delivery times will be stated on the product page above, or in your order acknowledgement page and email.

Orders for packets of seed incur a delivery charge of £2.99.

Orders which include any other products will incur a delivery charge of £6.99.

Where an order includes both packets of seeds and other products, a maximum delivery charge of £7.99 will apply - regardless of the number of items ordered.

Large items may incur a higher delivery charge - this will be displayed in your shopping basket.

Please see our Delivery page for further details, and more information on different charges that may apply to certain destinations.

For more information on how we send your plants please visit our Helpful Guide on plant sizes.

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