I've got some seeds started off and want to know how to retain moisture? - I
do have a few of those propogator lids (clear perspex, about 6 inches tall)
and they work fine, but I want something to cover the rest....I've tried
clingfilm etc but once the seedlings are an inch tall they hit the top, the
seed trays are on window sills near radiators and tend to dry out very
quickly.

Is there any way I can avoid spending any money?

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If God had intended us to drink beer, He would have given us stomachs.