On 11/03/2011 10:12 AM, harry wrote:
Get your builder's merchant to send you a big bag (about 800Kg) of
sharp sand. Park it up somewhere and you have a lifetime supply of
sand very cheap. Some "sand" is crushed limestone. You need to
examine it to see if this is the case..

Sand (even sharp sand) makes a bad soil additive IMHO. It makes the
soil very heavy and doesn't really increase drainage. I have tried it
and had a lot of pseudomonas problems in the sandy pots, presumably
because of water retention.

I use sharp sand in seed beds, indeed I get it from the builder supplies
in 40 kg bags. Hard on the old back...

-E