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The patch should be as level as possible. This not only allows easier maintenance but avoids drainage problems. The bottom of slopes can become very wet and boggy. Frost pockets can also develop at the base of slopes.
Whether you choose to use a raised bed system or not is personal choice but bear in mind that raised beds may need more regular watering. Do not use treated railway sleepers as these pose health risks and are no longer legally available for garden use.
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