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Unruly roof terrace Planters.
Looking for some advice in regards to these planters. The idea is to remove the weeds in order to plant herbs and possibly some other diverse shrubbery / flowers etc.
However my question is what's the best way to get a blank canvas. Ie remove the weeds and them not come back. The obvious idea would be weed killer then cut and remove.
Not sure if that is doing half the job. Ie. well end up weeding for the next 6 months.
Would if be nessary to excavate put some kind of weed barrier down etc? Any help ideas inspiration would be appreciated?!

However my question is what's the best way to get a blank canvas. Ie remove the weeds and them not come back. The obvious idea would be weed killer then cut and remove.
Not sure if that is doing half the job. Ie. well end up weeding for the next 6 months.
Would if be nessary to excavate put some kind of weed barrier down etc? Any help ideas inspiration would be appreciated?!

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No need for weedkiller … that would be a total waste of money and time. Those can just be pulled up.
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.