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Rhododendron Rubicon
Cardinal red flowers, black spotted on upper lobe. Compact truss. Glossy deep green foliage. Mid to late season. 1.3m x 1m

Rhododendron Gwilt-King
Item Details
Rhododendron Gwilt-King
Item Name
Rhododendron Gwilt-King
Item #
Payless Plants
Payless Plants
Unit of Supply
2.5 lit. HP
Annual Production
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Rhododendron Gwilt-King


Short Description
A very showy Rhododendron with masses of red blooms in spring. Leaves have a rust like tormentum on the underside. 1.2m x 2m across.


More Information
Parentage: R. griersonianum x R. arboretum ssp. Zeylanicum
Breeder: Caton Haig, Wales, 1938
Awards: Award of Merit (A.M.) Royal Horticultural Society (RHS) 1952
Synonyms: R. Gwylit King

A tough Rhododendron, compact growth, masses of red trusses about 20cm across. Dense growth habit, larger leaves covered with rust colored tormentum on the undersize.


The number one requirement to grow good Rhododendrons is quality top soil. Avoid clay and sand like soils.

When planting dig a hole wider than seems necessary so the soil will be soft and friable around the root ball. The roots of Rhododendrons are like fine filaments and will struggle in solid hard packed ground. For this reason, Rhododendrons planted in a lawn area may struggle especially in a dry season. After planting water in well to settle in and to remove air pockets. It is a good idea to cover the soil surface around the plant with humis to retain moisture - though do not use lawn clippings.

After planting and one good watering it should not be necessary to do any more watering, except in drought like conditions. Do not water every day, and even worse, several times per day.

Rhododendrons can be susceptible to mites and a few other pests. For best results spray with an insecticide in spring to keep new growth clean and vibrant. An alternative to insecticide is to use summer oil, or even a bit of dish wash liquid well diluted in water. Apply using a sprayer, or even a watering can with a rosette.

After flowering is finished remove dead flower heads to tidy up the plant. While old flower heads will fall off by themselves over time, removing dead heads will improve the appearance.


A very showy Rhododendron with masses of red blooms in spring.  Leaves have a rust like tormentum on the underside. 1.2m x 2m across.
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