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Tips:5¢ Advice:Free
Join Date: Aug-2001
Location: Silicon Valley
Country: USA
Posts: 9,747
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It's called "muck" - usually a 50/50 mixture of clay and peat kneaded together really well. That gets built up in a wall around the perimeter and the soil goes inside. You can cover the muck with moss after planting, or it will probably develop there quite soon.
Regards,
Matt
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