On Sun, 08 Mar 2009 13:26:12 +0000, Tim S wrote:

Weed fabric alone will be enough - cut the light off and nothing grows.

Well it does but not for long.

Sodium chlorate will poison the ground quite effectively

How long does it last in the ground?

A Glyphosphate based killer will get in the foliage and travel down to
the roots in the same plant

And breaks down in the enviroment so you can use it to clear an area and
be able to replant after a while.

Chemical only treatment may not get seeds. If you don't put a fabric down
they will grow under the decking. Personally I think a decent bit of weed
fabric is all you need.

--
Cheers
Dave.