Start by planning a path of staggered steps matching your stride. Using rhubarb leaf as a guide, carve each stepping-stone hole about 7cm deep.
Lay a base of gravel (2.5cm deep) in each hole, then top with a layer of coarse sand (1cm deep).
Prepare concrete, adding water slowly.
Blend concrete mix with a hand trowel until it’s thoroughly moist but still firm enough to mould.
Fill hole evenly with concrete. Using your hands, press and sculpt the concrete into a leaf shape.
Press rhubarb leaf, with vein-side down, on the surface of the wet concrete. Press firmly to make a detailed impression, then lift off the leaf.
Enhance the impression of the leaf veins by deepening them using a wooden skewer.
Cover the stepping stones with pieces of damp hessian. Keep stones covered and damp for a week to help the concrete strengthen while it cures.