Here's How

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  Step 1: Mark out area where bed is to be positioned. Remove turf and level area.
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  Step 2: Dig a 750mm hole in each corner of bed. Position corner post in hole, ensuring it faces directions in which sleepers will be inserted. Pour in concrete and mix according to instructions. Check if post is right height, and check plumb using spirit level, adjusting if necessary. Repeat for each corner and leave to dry.
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  Step 3: Measure and cut 2 sleepers in half – these make the ends of the raised bed. Position base sleepers, then top sleepers. Check height of top sleeper matches corner posts so capping sits flush along wall.
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  Step 4: Mitre corners of capping, then screw on top of sleepers, leaving a 20mm overhang on each side.
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  Step 5: Fill bed with soil. Rake to level and lightly compact. Plant seedlings or sow seeds, paying attention to recommended spacings on packet. Water in well with a solution of seaweed tonic.
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  Step 6: Spread mulch around seedlings, being careful not to push it up against seedlings or cover seeds. Water gently to lock mulch in place.