Detritus still marks the scene at Welcome Bay, on Tauranga Harbour, where mangroves were mulched in early 2011. Contrary to expectations that the mangrove debris would 'mobilise,' the tides failed to carry away the mulch, or the mud that supporters of the operation had hoped it would remove. In subsequent trials, the mechanical mulcher was followed by a beach groomer, which collected the slashed material. (Dave Hansford)