x2 on plain topsoil. The cheapest stuff won't have any additives.PLAIN topsoil with no added fertilizer.
Or fill in with coarse wood chips or UNDYED mulch.
Otherwise sand should work, as would wood chips. Or a mix of any of the above.
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x2 on plain topsoil. The cheapest stuff won't have any additives.PLAIN topsoil with no added fertilizer.
Or fill in with coarse wood chips or UNDYED mulch.