{"id":1429,"date":"2016-07-03T16:17:58","date_gmt":"2016-07-03T18:17:58","guid":{"rendered":"http:\/\/gardenadvice.co.uk\/blog\/?p=1429"},"modified":"2016-07-03T16:17:58","modified_gmt":"2016-07-03T18:17:58","slug":"why-we-recommend-john-innes-composts-so-often","status":"publish","type":"post","link":"https:\/\/gardenadvice.co.uk\/newsandarticles\/why-we-recommend-john-innes-composts-so-often\/","title":{"rendered":"Why We Recommend John Innes Composts So Often."},"content":{"rendered":"

For a large amount of the advice we provide John Innes compost is the best tool for the job of growing plants because it easier for the gardener to maintain the correct level of moisture in the compost which is available to the plant creating a more balanced growth and better overall plant structure. Here are a few notes on the development and benefits of John Innes composts
\n<\/a>THE DEVELOPMENT OF THE COMPOSTS<\/b><\/span>
\nBefore the introduction of John Innes Composts, gardeners generally used a different compost for each species of plant. Usually the soil was not sterilised or heat pasteurised and consequently plant seedlings were often attacked and destroyed by soil-borne diseases and insects. Also the plant foods being added to the traditional composts were usually unbalanced, causing the plants to be either too “soft” in their growth and liable to diseases, or very “hard” and slow growing.<\/span>
\nIn the 1930’s two research workers at the John Innes Horticultural Institute, William Lawrence and John Newell, set out to overcome these problems and to formulate composts that would give consistently good and reliable results. After six years of experiments they determined the physical properties and nutrition necessary in composts to achieve optimum rates of plant growth. They also introduced methods of heat sterilising the soil that eliminated pests and diseases, but did not cause any checks to plant growth.<\/span>
\nThe result of this work was the introduction of two standard composts, one for seed sowing and one for potting. These “John Innes” composts revolutionised not only the ways in which composts were produced, but also the growing of plants in pots. Now, after being used very widely for over 50 years, the basic formulae remain the same – tried and tested and still popular amongst discerning gardeners for growing the best quality plants with the minimum of attention. Naturally, the plant nutrients have been updated to gain the benefits of improved fertiliser technology.<\/span>
\n<\/a>WHAT ARE JOHN INNES COMPOSTS?<\/b><\/span>
\nJohn Innes Composts are a blend of carefully selected loam or topsoil, sphagnum moss peat, coarse sand or grit and fertilisers. The loam is screened and sterilised and then thoroughly mixed with the other ingredients in proportions designed to achieve the optimum air and water-holding capacity and nutrient content for different types and sizes of plants. The basic John Innes Composts are:-<\/span>
\n<\/a>JOHN INNES SEED COMPOST<\/b>\u00a0– the traditional mix for sowing almost any type of seed, with sufficient nutrient for early development. May also be used for rooting soft cuttings.<\/span>
\nJOHN INNES POTTING\u00a0<\/a>COMPOST No.1<\/b>\u00a0– for pricking out or potting-up young seedlings or rooted cuttings. This composts has a carefully balanced nutrient content to suit most young plants.<\/span>
\nJOHN INNES POTTING\u00a0<\/a>COMPOST No.2<\/b>\u00a0– for general potting of most house plants and vegetable plants into medium size pots or boxes. Contains double the amount of nutrient in JI No 1 to suit established plants.<\/span>
\nJOHN INNES POTTING\u00a0<\/a>COMPOST No.3<\/b>\u00a0– a richer mixture for final re-potting of gross feeding vegetable plants and for mature foliage plants and shrubs in interior planters or outdoor containers.<\/span>
\nJOHN INNES\u00a0<\/a>ERICACEOUS\u00a0COMPOST<\/b>\u00a0– A specially formulated sterilised loam-based, lime-free compost with essential plant foods for most lime-hating subjects, such as Azaleas, Heathers and Rhododendrons, etc.\u00a0<\/span>
\n<\/a>WHAT ARE THE INGREDIENTS?<\/b><\/span>
\nThe function of each of the ingredients in John Innes is briefly as follows:-<\/span>
\nLOAM<\/b>\u00a0– Loam is the most important ingredient in the compost as it provides the main “body” of the compost. It also forms the base of plant nutrition by supplying clay, which has a cation and anion exchange capacity, that is, it absorbs and releases plant nutrients as required. Loam also contains essential micro-elements and some organic matter which provides a slow release of nitrogen to the plant.<\/span>
\nPEAT<\/b>\u00a0– Sphagnum Moss Peat in the John Innes Compost increases the total porosity and improves both the aeration and the water-retaining capacity. Peat decomposes slowly into humus.<\/span>
\nSAND<\/b>\u00a0– The coarse sand or grit is used as a physical conditioner to allow excess water to drain from the compost and thus prevent water-logging. It also helps to provide stability for larger plants.<\/span>
\nFERTILISER<\/b>\u00a0– The compound fertiliser in John Innes Compost provides a wide spectrum of plant nutrients needed for balanced growth, including :-<\/span><\/p>\n

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