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I run a forest school at a primary in Devon and we also plan to set up some raised beds for veg. But the only space is on an area of tarmac. So m question: can raised beds be put over tarmac that doesn't drain and how deep do they need to be? What to do about excess water draining from the base of the bed?

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Joined in Nov 2008

Country: United Kingdom

County: Devon

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