I go and collect seaweed.(especially after Autumn storms)..ONLY the dead stuff though, I have never bothered rinsing it.

You can make 'tea' as suggested...smells like death.

Or If you want to get the compost heap really steaming that's the best activator I know. Makes compost in weeks.

Brilliant for asparagus, tomatoes (other fruiting crops) and traditionally used for spuds ....or just use as (an autumn particularly for me) mulch anywhere...LOADS of trace elements in it.

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Paul