Rhododendron suoilenhense      (seedlings from AC 4458)

Rhododendron suoilenhense (seedlings from AC 4458)

Item: SSUO

in stock In stock

Flowering Month:
Flower Colour:
White & Cream
Height After 10 Years:
Not Scented
Interesting Foliage:
To -10 °C
Currently Unavailable
email me when in stock
3 litre
Currently Unavailable
email me when in stock
7.5 litre
15 litre
Available stock: 4
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Picture of a 3 litre plant for illustrative purposes only

(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. Early intoductions to the UK have produced tall, majestic and fast growing trees when grown in good conditions. Full hardiness is not confirmed yet, but it seems to be hardier than other big leaved rhododendrons such as R. macabeanum or R. sinogrande. Height 150-175cm in 10 years. Requires moist acid soils.

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.

Customer Reviews

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"Excellent service fast delivery and well packed, The rhododendron suoilenhense is flawless along with the price very happy customer thank you to all involved much appreciated"
Star Rating 5
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"Lovely healthy plant. I feel fortunate to have been able to acquire this rare large leaf rhododendron."
Star Rating 5
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"Great plant well packed really impressive "
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"Fantastic plant, good size & healthy."
Star Rating 5
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"Very beautiful, large plant. Arrived very quickly, well packaged. Thank you millais."
Star Rating 5
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"Gorgeous healthy Rhododendron, arrived in perfect condition and exceeded expectations "
Star Rating 5
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"Plants arrived quickly and in perfect condition, thank you."
Star Rating 5
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"Excellent quality plant as usual "
Star Rating 5
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"Excellent plant received very quickly and very well packed. Plenty of buds and leaves currently being produced. Not yet planted as waiting for the weather and soil to warm up. Highly recommended."
Star Rating 5
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"Good quality plant supplied"
Star Rating 5
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"It's always a thrill to be able to buy these wonderful big leaf species. I hope more are in the offing."
Star Rating 5
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"Very healthy plant received. This is my third plant from here thanks "
Star Rating 5
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"Superb plant. Extremely happy and have planted out today"
Star Rating 5
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"Nice healthy plant, can’t wait to watch it mature."
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"Another wonderful plant from Millais."
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"I'm really delighted with this plant. Healthy and handsome. Thank you."
Star Rating 5
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"Always , we have ver fine rhododendrons of you .Top quality."
Star Rating 5

Good to know

Wonderful architectural plants with huge leaves up to 60cm long! These are choice woodland Rhododendrons needing the very best sheltered positions to allow them to grow to their full stature of up to 5 metres. As a bonus, flowering will typically start after 6 years, but can take up to 10 years. Big leaved Rhododendrons are among the more tender of our range, but are well worth trying if you have the correct conditions. They are best suited to sheltered woodland in the milder regions of the UK, though they can also be used as feature plants in sheltered courtyard gardens. Winter protection is recommended for young plants.

Rhododendrons like moist acidic soil, with good drainage, and plenty of organic matter such as leaf-mould and added ericaceous compost. Big-leaved species should be given the best planting positions, which are neither too wet nor too dry. For a guide to plant spacing, use the height we give in 10 years as a guide to the distance between each plant, or approximately 1 plant per 3m². Plant no deeper than the top of the rootball, and dig in plenty of good ericaceous compost around the sides. A teaspoon of slow release feed is sufficient for a 3 litre plant, rising to a small handful for a mature plant. Plants can be grown as single stemmed trees, or the leader can be pruned as a young plant to encourage a more bushy habit. You may need to give protection from deer rubbing their antlers on the stems

Please note: Big leaved Rhododendrons need to be sheltered from wind to prevent the large leaves being broken off at the petioles (stalks) during gales. Moisture control is critical to prevent moisture stress and misshapen leaves, so we do not recommend them being grown in pots.

For further advice, For further advice, see here

Size Guide

Size guide

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

Delivery & Returns

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