3ft Specimen Rhododendron 'Horizon Monarch' - 15L Pot

Code: PL3012715L
3ft Specimen Rhododendron 'Horizon Monarch' - 15L Pot
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3ft Specimen Rhododendron 'Horizon Monarch' - 15L Pot
Rhododendron 'Horizon Monarch' - 15L Pot

‘Horizon Monarch’ is a vigorous, spreading, evergreen shrub. In May it flowers and produces bright red to pink buds that open to reveal large clusters of funnel-shaped, creamy yellow flowers that often have a small red or pink flare.

With its gorgeous, leathery, dark green leaves and stunning flowers it would look brilliant planted along a border or trained over a wallside or trellis. This hardy shrub is happy in any aspect, except north facing, placed in a sunny or partially shaded position in moist, well-drained soil.

‘Horizon Monarch’ has been awarded the Award of Garden Merit given by the Royal Horticultural Society (RHS), which helps gardeners make informed choices about plants.

  • Arrives as: 15L Pot
  • Height on Arrival: 60-100cm
  • Approx. Growth Height and Spread: 1.5-2m x 1.5-2m
  • Flower Colour: Yellow
  • Growth Rate: Vigorous
  • Evergreen/ Deciduous: Evergreen
  • Scented: No
  • Hardiness: Hardy
  • Position: Partial Shade
  • Habit: Upright/Spreading
  • Soil: Clay, Loam, Sand


Choose a sheltered site with dappled shade, however, dwarf alpine species will tolerate full sun. Avoid sites exposed to early morning sun in spring, as this may damage frosted flowers.

Ensure the soil conditions are correct. Rhododendrons must have moist but well-drained, acid soil between pH 5.0 and 6.0 that is rich in organic matter.

October or March/April are the best times for planting. Don’t plant deeply, as rhododendrons are surface rooters. Apply a loose 8cm mulch of acidic organic material and water well to finish.

If you have alkaline soil, grow rhododendrons and azaleas as container plants. Use ericaceous loam-based compost and repot every other year into fresh compost in spring.

Caring and Maintenance

To keep your plants performing at their best, in spring, apply slow-release ericaceous fertiliser and renew the acidic mulch and keep well watered.

Rhododendrons don’t require pruning apart from removing dead wood and deadheading if practical. If the plant outgrows its space, cutting back is tolerated best from deciduous azaleas and rough-barked rhododendrons. After cutting back, mulch, feed and keep well watered.

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This is an example of one of our 15L R. Horizon Monarch


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