Rhododendron Polarnacht

Rhododendron Polarnacht


in stock In stock

Flowering Month:
Flower Colour:
Purple & Blue
Height After 10 Years:
Not Scented
Interesting Foliage:
Below -20 °C
5 litre
Available stock: 6
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Much admired dark purple wavy-edged flowers with deep red spotting. Flowering in late May to early June it has good dark green foliage with a dense, compact habit that grows wider than it does tall. It is a modern hybrid from Rhododendron Purple Splendour but has a much deeper colour. Translated from German, it means Polar Night and we love the very dark distinctive colour. Height 125-150cm in 10 years.

  • Recommended for: Striking flower colour.
  • Easy to grow.
  • Ideal position: Most garden situations.
  • Habit: Dense.
  • Group: Hybrid Rhododendron.
  • Parentage: 'Turkana' X 'Purple Splendour'.
  • Hybridization date: pre 2000 (1976).
  • Bred by: H. Hachmann. Origin: German.
  • Ideal soil: pH 4.5 to 6.
  • RHS Hardiness Rating: H7.
  • How we usually propagate this plant: Graft.

Customer Reviews

By on
"Lovely healthy plants with lots of flower buds packed with care and delivered really quickly."
Star Rating 5
By on
"Thank you. A truly exquisite specimen. I counted over 30 huge bud clusters. The violet purple of the flowers and the beautiful contrasting white stamens are such a sight to behold. It arrived overnight by APC and in perfect condition. It is still blooming. I LOVE it. Thank you."
Star Rating 5
By on
"The plant was delivered in good condition and in bud it is still flowering beautifully. Thank you for a lovely plant ."
Star Rating 5
By on
"Plant arrived in good condition well packed. Looking forward to next season when it should have got itself bedded in. Attentive service. Thanks."
Star Rating 4
By on
"A very healthy and sizeable rhododendron with an excellent root system. Flowerbuds ready to go, and a good colour to the foliage. I'm really pleased with it, and can't wait to see it in flower. It was well packaged, no damage, and I was notified of the delivery beforehand. Delivery time was accurate. Really can't ask for more!"
By on
"Gorgeous, healthy rhodi, well packaged & arrived in good condition. "
Star Rating 5
By on
"Absolutely fantastic. The plant was very large & very healthy & arrived very quickly & was packed beautifully. A real 5star performance & I will be recommending to all my friends. Thank you so much."
Star Rating 5
By on
"After 20 years of buying plants online this is the first time it surpassed my expectations its the healthiest looking plant and larger than expected.fast delivery well packed "
Star Rating 5
By on
"Excellent plant"
Star Rating 5
By on
"Excellent plant. In full bloom when arrived. Very good value"
Star Rating 5

Good to know

Our best-selling Rhododendrons, ideal for hedges, screening and large displays, growing to 125-200cm in 10 years.

Most of these plants can be described as ‘Hardy Hybrids’, the tough dense plants which are ideal for hedging and screening, or for planting within a border. Some can even be described as ‘Ironclads’ – tough plants that will withstand temperatures of below -20°C, and the coldest European winter. With care, it is possible to select varieties which flower from January until June, with flower trusses in a wide range of colours. With their dense downward pointing leaves, recent research has shown that they reflect sound waves and create some of the best natural sound barriers. They will take sun or shade, but dappled is best. Most hardy hybrids will bud up and flower as a 5 or 7.5 litre plant.

Also in this section are more tender varieties with delicate bell-shaped flowers that hang in small clusters, and sparser foliage. These are better suited to the more sheltered woodland garden, where they can add great character without creating dense plantings. Some woodland types have a more upright and open tree-like habit, so are not suited for screening purposes, but make great focal plants in the garden. Yellow and orange flowering varieties are always slower growing and more fussy, requiring excellent drainage. You won’t find these special plants in a garden centre, and they may take a year or so longer before they start flowering, but they will grow into choice long term plants.

Those flowering from December to March often flower erratically through the winter, with blooms opening in succession. This means that at least some blooms will avoid the frosts, and give some welcome flower to brighten up a winter’s day. Trees with overhead canopy can give a few degrees of frost protection to the flowers. Late flowering varieties also benefit from tree canopy to provide shade during the summer months when the sun is that much stronger.

Rhododendrons like moist acidic soil, with good drainage, and plenty of organic matter such as leaf-mould and added ericaceous compost. Plant no deeper than the top of the rootball, and dig in plenty of good ericaceous compost around the sides.  For a guide to plant spacing, use the height we give in 10 years as a guide to the distance between each plant. Spacing can be closer when planting a hedge, or if you are impatient. For planning a border, spacing should be one plant per 3-4m². Give a teaspoon of slow-release feed at the 5 litre size, rising to a handful full for mature plants. Tall hybrid rhododendrons are not typically damaged by deer or rabbits. They are not recommended for container growing, which they would outgrow in a few years.

Please note: Some varieties are wider than their height. Specimen size plants (eg 80-90cm) will be measured by their largest measurement which could be the spread of the plant.

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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