Mulching flower beds

Catherine
by Catherine
I often see yards with lovely winding flower gardens that appear to be raised with only mulch and nothing holding the mulch in place such as a brick, metal or plastic border around it. I've tried duplicating that, but the mulch does not stay in place on the edges and it ends up looking messy. I am attaching a photo that I found on Pinterest which better shows what I'm referring to. Is there a trick to doing this? Thank you in advance!
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