In article , Andrew G wrote:
The black PVC will help get the temperatures up, as will the compost itself.
If your compost doesn't get hot then it will not kill the seeds.
The only problem with this method is ensuring the seed/weed gets into the
centre of the compost where all the heat is.

I'm not sure that you can gaurantee that it'll be hottest in the centre.
There are other physical factors to take into consideration.

Weeds themselves should not be a problem. Weeded properly by getting most of
the soil (not leaving a big clump of soil attached) off the roots by giving
it a quick shake and those weeds should die. I have never seen a weed start
growing again after being pulled out, unless the roots are partially buried
in the soil.

Most weeds do die when their roots are exposed to the atmosphere, though
what about hardy weeds like couch grass?

--
Jeremy Lunn
Melbourne, Australia
Homepage: http://www.austux.net/
http://www.jabber.org/ - the next generation of Instant Messaging.