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in : Pots & containers: Window boxes
Cover the bottom of the window box with crocks, then two-thirds fill it with compost.
Plant the myrtle in the centre of the box surrounded by the campanulas. Top up the box with compost, gently firming it around the plant roots with your fingers.
This container will overwinter outside if there's a protective wall close by; otherwise, insulate the box with bubble polythene to protect the roots from frost.