Millais Nurseries Ericaceous Slow-Release Fertilizer 20kg

Millais Nurseries Ericaceous Slow-Release Fertilizer 20kg


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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 and 5kg 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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"I want to change my review, actually I understand the deliver which I was complaining about, was not the mistake of Milais. Instead of writing a bad review, I should have informed Milais that I didn’t get the delivery. Readers , I withdraw my complaints and I must appreciate the amazing collection of Rodo Millais have. Wish them all the success and looking forward to visit them again soon .... "
Star Rating 5
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"We had been to this place to pick up rodo and they have an amazing collection, unbelievable collection of Rodo and they know a lot. But later we ordered a rodo fertiliser online but never received that delivery! It’s almost 2 months now ..."
Star Rating 4
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"Excellent food for the rhodies. Have used this for a number of years now, and the results are fantastic."
Star Rating 5
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"Very well packed and delivered on time. There was also the large Flavia Rhododendron on a pallet and with which I am very well pleased."
Star Rating 5
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"Have bought same for quite a few years. Plants look fresh and green. Good to be able to buy in bulk at an affordable price."
Star Rating 5
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"This is my second purchase. It really helps new plants get away fast."
Star Rating 5
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"first rate customer service"
Star Rating 5
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"This fertiliser is brilliant, not only encourages healthy growth, but also flower bud formation, for me it is a five star product."
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"I used this fertiliser in combination with the Bulrush compost and my heathers are unrecognisable! Lots of strong new growth and one that was almost for the compost heap had made a miraculous recovery. I am very happy with Millais Nurseries and their products. "
Star Rating 5
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"Growing lots of new shoots "
Star Rating 5
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"I have not really used this before and have no idea of what it will do to improve the plants... If the company is anything to go by then I presume it should be good stuff."
Star Rating 3
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"I have only just used this so can't comment on how good it is but it is easy to use."
Star Rating 5
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"Excellent product and service"
Star Rating 5
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"Not tried it yet, but looks good and service and delivery were great."
Star Rating 5
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"Am always pleased with plants and feed from Millais, the last rhododendron I received (Goldkrone) was a lovely specimen. Many thanks "
Star Rating 5
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"very pleased"
Star Rating 5
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"Brilliant stuff. "
Star Rating 5
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"Arrived well-packed. Good value-for-money. "
Star Rating 5

Good to know

We aim to offer an interesting range of sundries to ensure that your chosen plants get off to the best possible start in your garden. Plant them properly with the right products, and they will reward you well for years to come!  Add some of these essentials when you place your order.

Composts -  Excellent quality and value. A far better professional quality compost than anything offered by the main garden compost suppliers. Our compost has proper aeration and drainage, and is not milled to dust like so many other composts

Fertilizer - We tried the lot, and now we have commissioned our own slow-release fertilizer which we use on the nursery with great results, as it has all the right ingredients for ericaceous plants! We also offer a range of ‘curative’ fertilizers to correct deficiencie

Natural tonics and controls - We have sourced some really good professional grade organic products that work, and that we use on our nursery with good results. These help to keep your plants in tip-top condition.

Tools - Everyone needs a new pair of gloves, secateurs and some good tools from time to time. We list some quality products at a good price.


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

Delivery & Returns

Our website calculates the delivery charge according to weight and delivery location throughout the UK. To see these charges, please enter your postcode at the checkout, and you will see the charge vary as you add more items to your wheelbarrow.

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