I have just ordered a 100l of perlite and have already bought a smaller amount of vermiculite. Perlite does not absorb water, nor does it break up clay but it is good for keeping airy open spaces within soil as long as it is not compacted clay, when it will only rest on the surface in time. I will be putting perlite into all my raised beds as the compost does tend to become compacted.
The vermiculite hold moisture and I will be using that for seed sowing and potting on, it helps keep water levels even and helps prevent damping off if sprinkled on the surface. I will use the smaller grains for that. Important to use a mask when pouring both as they are dusty and fine
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