6" of shredded leaves is a lot for even garlic to push through.
I use old straw from the chicken barn, at about 3" to 4" thick. This seems about right, they always come up through it, and the moisture level isn't too high. There are a few weedy grasses that pop up, but not too many to pull in a short amount of time...
I fertilize the beds with feather meal before planting, and this has produced my best garlic ever.
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