The Bloke On Who Wants To Be A...
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For more on marking an answer as the "Best Answer", please visit our FAQ.the point of mulch is usually to keep mositure in the ground or to suppress weeds. ground cover plants will do this too. however, if the plants take a little while to establish or you plant them far apart you might still want to mulch while you wait for them to grow.
some people like to use gravel as a mulch between plants to show them off better.