Now I've managed to build nearly all 12 raised beds at the top of my
garden (a scaffolding plank long and 4 foot wide) I would like to cover
at least part of one or two to start early crops.

Can anyone with more experience of growing vegetables this way suggest
the best/most efficient means of warming the soil and/or growing under
plastic/fleece?

Janet
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Janet Tweedy
Dalmatian Telegraph
http://www.lancedal.demon.co.uk