can I build a raised flower bed using decking?

last month

We want to build an L shaped raised flower bed against our back garden brick walls using decking, anything I should know?
We'll use supports for it to be strong, brackets to attach to wall and floor, damp membrane to line it
Is decking strong enough, long lasting, and do we need to treat it? Cut end treat it?
We're buying the green pine decking from b and q, is it pre treated?

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United Kingdom
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