I've got several quite old terracotta pots that were given me by an
elderly gent who'd once been a market gardener. They all have single
good drainage holes and I normally put a flattish stone or a bit of
broken pot or polystyrene packing in the bottom, mainly to stop compost
falling straight out or washing through, rather than for extra drainage.

Saw this: http://www.bbc.co.uk/news/blogs-maga...nitor-27126160
and wondered if I should really try something else - bit of old cotton
cloth or something? Used tea-bag?

This article from last year by biologist Ken Thompson is on the same theme:
http://www.telegraph.co.uk/gardening...otty-idea.html

So do you crock or not?

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Sue