To fill the gap you could buy instant hedging, i.e. a hedge grown in a trough-shaped bag. Practicality Brown are near me and I've used them before. This is the link to their instant hedging page to give you an idea of how it looks/works https://www.pracbrown.co.uk/instant-hedge/
You may find a supplier close to you who offers the same.
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You may find a supplier close to you who offers the same.