Rhododendron Gwillt King

Rhododendron Gwillt King


unavailable Currently Unavailable

Flowering Month:
Flower Colour:
To -10 °C
Height After 10 Years:
Not Scented
Interesting Foliage:
Currently Unavailable
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7.5 litre
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(H4) Bright turkey red flowers in a semi-circular truss, with spotting on the dorsal lobe and deep basal nectaries. April-May flowering, and suitable for mild locations only. Height 125-150cm in 10 years.

This is a really good bright red flower of quality, and performs well in sheltered positions. Densely hairy on the undersides of leaves. It has recently been exhibited at RHS Rhododendron competitions, where it has been much admired on the show bench.

• Ideal position: Dappled shade in mild, sheltered gardens.
• Habit: Tree Like
• Group: Plantsman.
• Parentage: R. griersonianum (s) X arboreum subsp. zeylanicum
• Hybridisation date: Pre 1950 (1938)
• Bred by: C. Haigh. Origin: Penrhyndeudraeth, Wales
• Ideal soil: pH 4.5 to 6.
• RHS Hardiness Rating: H4.
• How we usually propagate this plant: Graft.
• RHS Award of Merit 1952

Customer Reviews

By on
"Excellant plant"
Star Rating 5
By on
"The Rhododendron arrived looking fresh and healthy, it was a great surprise to see it looking in great shape. It larger than I expected it to be. It is a really healthy plant and looks great being planted. I would highly recommend friends and family to purchase from Millais Nurseries. "
Star Rating 5

The Basics

Ideal soil

Acidic soil, good organic content, pH 4.5-6.0. Inkarho range of rhododendrons will tolerate soils up to pH7.5

Sun or Shade

Light dappled shade is best for most varieties.


Refer to hardiness rating. Give young plants protection.

Site Selection

Avoid close to trees, roots, invasive weeds, walls, hot patios, dry banks and waterlogged soils. Do not use weed matting or stone mulch.

Plant spacing

Use the height shown in 10 years as a guide to the distance between each plant. Allow room for plant to fill out. If planting closer for instant impact, be prepared to move plants after a few years.


  • 3 litre pot, dig in 10-20 litres of ericaceous compost.
  • 7.5 litre pot, dig in 20-30 litres of ericaceous compost.
  • 70-80cm specimen, dig in 60 litres of ericaceous compost.
  • 100-120cm specimen, dig in 120 litres of ericaceous compost.

Planting depth

Plant high in the ground, with the top of the rootball visible.


Slow-release ericaceous feed recommended in March and straight after flowering.


Recommended every few years.


The key ingredient! Keep moist all season, especially the critical time at end of June for flower bud initiation. Tap water is better than no water. Heavy dose at least once per week in dry weather.


Ensure good drainage in winter, especially with yellow flowering varieties. Avoid waterlogged sites.


Rhododendrons and Camellias: Not normally required. Tidy wayward shoots after flowering.

Evergreen azaleas and Bloombux can be clipped into a low hedge.

Magnolias and Acers: Formative pruning when young to shape into a tree or bush.


Remove old flower-heads, particularly on young or weak plants.

For further advice see here

Size Guide

Size guide

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