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A. John Innes No 2 will be perfect for potting on seedlings and young plants and for repotting houseplants. You could also consider using our Westland Houseplant potting mix
That being said, multi purpose compost is generally suitable for all plants – it may not be their favourite, but it will not kill them off. Q: How long does multi purpose compost last? Peat Free: is a more environmentally friendly alternative to conventional peat-based compost, using substitutes such as recycled green waste, coir or composted bark. Fine for all general garden uses, including containers.Sometimes there will be additional ingredients like seaweed; seaweed contains a lot of micronutrients that are beneficial to both the aesthetic appearance of the plant and its general health. Loam is the most important ingredient as it provides a natural reservoir of plant foods, trace elements and contains some organic matter which releases nitrogen slowly to the plant. The loam in J. Arthur Bower’s John Innes is screened and sterilised to avoid any soil-borne diseases and insects
http://www.gardenersworld.com/forum/fruit-andamp-veg/the-best-multi-purpose-compost-this-year/5249-2.html Lyon Greene wrote ( see)
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Then they tested for growing on young plants and seedlings - 20 snapdragon and 20 tomato seedlings were potted up in each compost. Again snapdragons struggle if nutrient levels are too high and tomato don't thrive if they are too low. They were grown on without feeding until the largest were ready to be planted out. All plants were rated on size, quality and leaf colour.