Rhododendron irroratum 'Polka Dot' BH2511

Rhododendron irroratum 'Polka Dot' BH2511


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Flowering Month:
Flower Colour:
To -10 °C
Height After 10 Years:
Not Scented
Interesting Foliage:

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(IRRORATA H4-5)  A super selection with striking flowers that are white and heavily spotted deep purple suffused pink in March-April. It has hairy pedicels, ovary and style. The plant is reasonably upright in habit, with a height of 125-150cm in 10 years.

This irroratum 'Polka Dot' clone is always one of the most striking flowers on the show benches at Rhododendron competitions. Our clone originates from Borde Hill Gardens which regularly won RHS show competitions with this clone. 

  • Recommended for striking flowers.
  • Easy to grow.
  • Ideal position: light sheltered woodland.
  • Habit: upright.
  • Group: Species Rhododendron.
  • Subsection: Irrorata.
  • Introduction date: for this clone pre 2000.
  • Species distribution: for irroratum NW and W Yunnan, Yunnan-Tibet border.
  • Approximate altitude: 1,800 to 3,700m.
  • Ideal soil: pH 4.5 to 6.0
  • RHS Hardiness Rating: H5.
  • How we usually propagate this plant: Cutting.



Customer Reviews

By on
"So glad to receive such a wonderful clean plant, of this great form. Can't wait to have it flowering in due course."
Star Rating 5
By on
"A large, healthy and vigorously growing plant arrived in excellent condition. Will bloom next year. Very pleased indeed with this."
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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