In article , says...
Adam Funk writes:
http://www.guardian.co.uk/lifeandsty...d-wives-tales-
gardens
or
http://gu.com/p/2yyd7

This was the one that shocked me:

Crocks in pots improve drainage
...
False: a drainage layer in the bottom of pots reduces the volume of
soil available to plant roots. Don't add gravel or crocks, but ensure
pots have drainage holes.

I always feel silly when on all the TV shows they say to add grit to
compost whenever you re-plant anything for drainage, but garden centres
don't sell bags of grit in their compost section, so what are you meant
to do?? Big bags of grit from the aggregate section in B&Q? How coarse
should the stones be?

Wish they'd answer these questions for the noobs like me

kate xx

They do sell grit in garden centres, along with sharp sand and bigger
stones, its not the cheapist way to buy grit but for smallish quantities
its probably not worth sourcing cheap bulk grit (hoticultral suppliers)
Its generally in smaller bags typically around 25KG, try asking "where
have you hidden the grit"?!
If you want to acheive the same effect without the weight use perlite
instead of grit.
--
Charlie Pridham, Gardening in Cornwall
www.roselandhouse.co.uk
Holders of national collections of Clematis viticella cultivars and
Lapageria rosea