Deciduous Azalea Sun's Head (R. Sonnenkopfchen)

Deciduous Azalea Sun's Head (R. Sonnenkopfchen)


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Flower Colour:
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5 litre
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15 litre
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(H6) NEW! Bright rich yellow star shaped double flowers with a golden yellow blotch on the upper lobe, and a faint pink edging when first open. The flowers form a huge ball shaped truss with an intense sweet fragrance in May. They are 45-50mm across, and all the stamens are petaloid, adding more floral impact. Good autumn foliage colour with yellow tones. Height 125-150cm in 10 years.

A stunning flower, bred and Registered in Germany by top rhododendron breeder Holger Hachmann as R. Sonnenkopfchen, which translates to Sun's Head. Its flowers are similar to the old variety R. 'Narcissiflora', but brighter, larger and more scented.

  • Recommended for stunning bright colour.
  • Easy to grow.
  • Group: Deciduous Azalea
  • Parentage: Orangeade’ (s) X Narcissiflorum
  • Hybridization date: 1998, Registered 2011
  • Bred by: Holger Hachmann. Origin: Northern Germany.
  • Habit: upright.
  • Ideal position: Most garden situations with some sun.
  • Ideal soil: pH 4.5 to 6.
  • RHS Hardiness Rating: H6.
  • How we usually propagate this plant: Cutting.
  • Awards: Gold medal at BUGA Schwerin in 2009. Silver medal at Rhodo 2010 in Westerstede.

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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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