Millais Nurseries Ericaceous Slow-Release Fertilizer 3kg

Millais Nurseries Ericaceous Slow-Release Fertilizer 3kg


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3 kg
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Our own brand of top quality Slow-Release Fertilizer formulated and made to our unique recipe, and as used on our nursery. The analysis is 11-12-8+2.8MgO, and it is rich in iron and magnesium which is perfect for all our Ericaceous plants. We have used this successfully for several seasons now, and we're getting brilliant reports from our customers too. 

We use top quality professional fertilizers to obtain the best growth and budding, but until now these have not been available to the amateur market. In consultation with a leading fertilizer manufacturer we have developed this excellent fertilizer which we use throughout our own nursery. It has a high organic mineral content, and the Phosphate and Magnesium is derived from re-cycled sewage sludge which has been known for years to be great for Rhododendrons, Camellias and Magnolias. (You may have seen a programme on TV about the incredible new sewage treatment plant at Reading. This is where these nutrients come from, but don't worry - it's all very clean and it doesn't smell!). It also contains a small percentage of blood, fish and bonemeal giving a slow release of NPK, which breaks down organically.

This fertilizer is pelleted, and gives an initial boost to the plant, and then a slow release of valuable nutrients over 6-9 months. It is suitable for broadcasting over the ground at 50g/m2, or pot dressing at 0.5g/litre of compost. Best applied twice per year in early spring and summer where there is a recognised need. 


The 1kg size is packed in a polythene bag, the 3kg, 5kg and 10kg are in convenient plastic tubs with a handle, and the 20kg comes as a large 'commercial sized' sack. All represent excellent quality and value compared with branded products.

Customer Reviews

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"Good product I’ve used before, can’t understand the over the top security measures on your website in order to buy products, I.e passwords, anti spam texts etc. Your a nursery selling rhododendrons for goodness sake."
Star Rating 4
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"Its the only one I now use for my rhododendrons"
Star Rating 5
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"Arrived in very good time. Well packaged."
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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

Delivery & Returns

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