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Raised planters

I’m building two raised planters. Their height will be about 500mm above ground level. 600-650mm in total.

one of the planters is 1.8m wide and the other is 5m wide. Both are 1.1m deep (front to back).

im using concrete blocks, laid on a concrete footing which is 400mm thick. The soil underneath is light clay. 

Will single skin be strong enough? Or do I need to make them double thickness? 
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