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Beds agenda walls

I have resently dug a bed agenst the wall of my house.  It is a sun trap and a grew great tomatoes in grew bags there last year.  It is now planted. 

After discussion with family I have been told I should have put in a waterproof membrain to protect the foundations.  Prior to the bed there was turf and it was always dry and brown. 

Should I take everything out now and put in the waterproof membrain, or is it safe to wait for my tomatos to fruit and then do it?

Advice would be appreciated. Many thanks


Last edited: 03 June 2017 06:06:17


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