I have a few inches of mulch and it works wonders. The occational weed pokes through and it's alone, weak from battling through a few inches and takes one little pull and it's 90% root, 10% shoot and I have a little chuckle at how easy it was to kill. The breakdown of the mulch is also a very good fertilier. The mulch also protects your roots from Calgary's large swings in moisture, drying out, thawing early, etc. and looks and smells great. Yeah that might only last two years and then you top it up - but what's broken down is very good for your soil.
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