Dwarf Rhododendron Bloombux INKARHO

Dwarf Rhododendron Bloombux INKARHO


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Flowering Month:
Flower Colour:
To -20 °C
Height After 10 Years:
Interesting Foliage:
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2 litre
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5 litre Topiary Ball
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(H6) NEW.  A wonderful flowering alternative to troublesome box hedging!  Lots of clusters of soft pink flowers in June.  The plant responds well to trimming after flowering.  Height 50-75cm in 10 years.  Easy to grow in most soils.

This superb new variety was raised by the INKARHO syndicate as 'Microhirs3' with PBR Plant Breeders Rights.  It is suitable for growing on most garden soils, from very acidic up to pH7.5.  It is grown under licence in Germany, and the first plants were released in 2014. It is a hybrid between two charming dwarf growing species, R. hirsutum x micranthum, which has produced a striking healthy and undemanding rhododendron with lovely flowers that are also attractive to bees and butterflies 

It takes trimming in its stride, so if you want to clip it after flowering, you can create any shape you want, including squares, balls and triangles, or simply trim into low hedges to go around your flower-beds. This plant avoids the awful box-blight, stays green when trimmed, and flowers beautifully, so it is a brilliant replacement for box hedging! 

The Nugget sized plants are supplied in 10.5cm (4') diameter pots, and are nice and bushy with a height around 15cm (6'), often with flower buds. Ideal for planting in quantity.

Customer Reviews

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"These dwarf rhododendrons are brilliant - just right for a less acidic soil. I have bought these to line a path as they can be trimmed to shape, if necessary. They arrived promptly, were very well packed and in excellent condition. I can highly recommend Millais as have purchased other rhododendrons from them in the past, all of which have been excellent."
Star Rating 5
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"Plants arrived in fabulous condition and packaging/delivery was faultless. Plants are now thriving in the garden."
Star Rating 5
By on
"healthy, ;lush little plants, can recommend "
Star Rating 5
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"I Very happy with the plants, the delivery d the service from Millais "
Star Rating 5
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"Very pleased with the plant and the service provided by the Nursery. The Bloombux has been planted and is flourishing "
Star Rating 5
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"larger plants than i was expecting! So very nice."
Star Rating 5
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"Superb little plants, I have planted them and they look fantastic. Loads of little flower buds on them so we are very excited to see them flower. Eventually I am hoping these little nuggets will grow and form a low hedge. As ever, great advice from the team at Millais about planting and looking after them going forward. I am sure I'll be back to buy more. "
Star Rating 5
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"Absolute top class,plants arrived in fantastic condition.These little wonders are covered in buds and are so healthy looking in the new planters.Will definitely be buying again from Millais Nurseries. "
Star Rating 5
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"Lovely plant, very good quality, prompt delivery, thank you"
Star Rating 5
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"I absolutely love these rhododendrons, I can’t wait for the flowers to bloom. The plants arrived in perfect condition. "
Star Rating 5
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"Plants arrived in excellent condition and seem to be thriving. We are quite pleased with the result."
Star Rating 5
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"The plants arrived a very timely manner and were all in good condition when arrived, growing nicely in garden. Can’t wait for them to get bigger. Would definitely recommend this nursery."
Star Rating 5
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"Loved the plants, all arrived in good condition and are now planted out, awaiting blooms! Good quick service and good value. Plants were described as Nugget size, but they were bigger than expected..thank you"
Star Rating 5
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"Again I have bought these rhododendrons as I feel they would be better suited to my soil than the "normal" ones. They are lovely low growing plants which I will order more of when I have had a chance to see how they fare in my soil."
Star Rating 5

Good to know

These are the plants which we have featured in our recent RHS Chelsea Flower Show exhibits, with extensive reporting on the BBC Chelsea TV programme. Interest from new customers around the country has been exceptional, and gardeners have been delighted to learn that they can now grow their favourite plants on most garden soils.

The revolutionary new ‘Inkarho’ lime tolerant rootstock is particularly recommended for growing rhododendrons on neutral clay soils, up to pH7. This patented rootstock was developed from a rhododendron growing in a German lime quarry, and has been the subject of an extensive 20 year breeding and testing programme. They are grown under licence in Germany, and are some of the few plants that we have to buy in. Choice tall hybrids and compact yakushimanum varieties are grafted on the rootstock enabling them to be grown in a much wider range of soil types than ever before. They are hungry plants and require more feeding than other Rhododendrons to keep their foliage a healthy dark green. We recommend our own recipe Millais Nurseries Slow Release Fertilizer and plenty of good Ericaceous compost for best performance. Failures are rare, but occur when there is insufficient soil preparation, and insufficient feed. Without feed, the plants will start to wither and the foliage will go yellow.

The varieties selected are all tough and will flower from a young age. For a guide to plant spacing, use the height we give in 10 years as a guide to the distance between each plant. Plant no deeper than the top of the rootball, and dig in plenty of good ericaceous compost around the sides. Feed at the rate of a teaspoon of ericaceous slow release fertilizer per plant at the 4 litre size, rising to a tablespoon per plant for a 12 litre plant, and a small handful for a more mature specimen.  For growing in pots, please select the lower growing yakushimanum hybrids, and use good Ericaceous compost 

Please note: Some varieties are wider than their height, especially yakushimanum hybrids. 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

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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