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Rhododendron suoilenhense CWT 6498

Item: SSUO

unavailable Unavailable

Flowering Month:
April
Flower Colour:
White
Hardiness:
To -10 °C
Height After 10 Years:
150-175cm
Scent:
Not Scented
Interesting Foliage:
Yes
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(GRANDIA H4-5) Recently collected from Vietnam. Creamy white campanulate flowers with maroon basal flashes, in a rounded truss, April. Large foliage with indumentum on older leaves. Height 150-175cm in 10 years. Requires moist acid soils.

CWT6498 = Alan Clark, Hannah Wilson and Jamie Taggart. North East Vietnam 2011

First introduced by Alan Clark and Keith Rushforth in 1992, collected in Lao Cai province, Vietnam. Growing between 2200-3140 metres, mature plants reach heights of 12 metres.

Flowers are broadly tubular campanulate, 8 lobed, in a truss of 15 flowers. One of the distinguishing features of R. suoilenhense is the juvenile foliage differing from the foliage of a mature flowering plant. Juvenile foliage is widely oblong, rugose, chartaceous (papery) and glabrous, with a wavy appearance. Mature leaves are elliptic to oblanceolate, dark green, shiny and almost flat, with a suede like brown unistrate indumentum on the lower surface, and measure 20-35cm long by 9-16cm broad, with a rounded apex. Petiole is round.

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.

Shelter

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.

Compost

  • 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.

Feeding

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

Mulch

Recommended every few years.

Water

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.

Drainage

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

Pruning

Not normally required. Tidy wayward shoots after flowering. Evergreen azaleas and Bloombux can be clipped into a low hedge.

Deadheading

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


For further advice see here

Size Guide

Size guide

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