On Sat, 19 Mar 2011 Bill Grey wrote:

How effective would covering the various plots with black PVC for a season?

I do that. It saves all the bother of cutting down the top growth so it
gives you a good start but it can give one a false sense of security.
The ground looks nice and clean and it doesn't solve the problems of
weeds but it weakens them a lot and the ground is a lot easier to dig.

I get mice and other furry animals under the PVC but they quickly
scarper when I pull back the cover!

David

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David Rance writing from Caversham, Reading, UK
http://rance.org.uk