You can buy metal upstand edging. It is pricey af though.
I built a wooden upstand (far more fiddly when it came to laying down the EPDM layer) with zinc capping (also pricey af).
There are pebbles around the edges, with a cheap lawn edging strip that has now become redundant as the sedum had bedded in.
Excellent advice. Thanks. I'm going to see if I can get cheap angle.
@Lanterne_Rouge started
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You can buy metal upstand edging. It is pricey af though.
I built a wooden upstand (far more fiddly when it came to laying down the EPDM layer) with zinc capping (also pricey af).
There are pebbles around the edges, with a cheap lawn edging strip that has now become redundant as the sedum had bedded in.