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Perlite -
Perlite - those little white bits you find in all the best composts - allows you to achieve those fluffy potting compost mixes full of air spaces and retained moisture you've always dreamed of and will give your greenhouse seed sowing and growing activities a real leg-up. Here's the science bit; perlite is natural volcanic rock which is heated to a high temperature to produce a lightweight micro-porous structure and this material proves ideal for holding air and moisture reducing compaction and generally giving your plants the time of their lives! Perlite is a must for any greenhouse grower novice or serious and the re-sealable bag this most useful of compost additives comes in helps to prevent the contents becoming prematurely damp. Simply mix perlite with any potting mix and reap the benefits!