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It is hard to call stone wool soil. I therefore prefer the term growing medium for the different materials in which plant roots grow. Soil, coir, clay pebbles and pumice can all do the job, although their properties vary considerably. The growing...

other conditions. In hydroponics the pH can change faster in a small tank than in a large one. Potting compost and other growing media can affect the solution in different ways. A change in pH alone therefore does not mean the plant needs more of a...

Icelandic articles and first-hand growing experience to English-speaking readers. Oxide equivalents or elements? Growing media: what should surround the roots? Plant nutrition Lighting pH (acidity) What is good to grow indoors? Healthy roots The Kratky...