Historic pohutukawa in Mangonui protected

Small gardens have been planted to further beautify the area.
Small gardens have been planted to further beautify the area.

The decline of the iconic pohutukawa trees lining the Mangonui waterfront, between the wharf and the Four Square, had been a concern for visitors and locals alike over recent years, but they have a much brighter future now.

Photographs from 1933 showed the row of six trees were already an important feature of a much younger Mangonui settlement, but 100 years was relatively young given the potential lifespan of Metrosideris excelsa, conservationist (and Transition Town Kaitaia member) Gill Minogue said.

'Honeycomb' grids now protect the roots of the pohutukawa on Mangonui's waterfront.
'Honeycomb' grids now protect the roots of the pohutukawa on Mangonui's waterfront.

As the trees were on the Far North District Council district plan Notable Tree list, the council was legally required to protect their health and to apply certain conditions to any works undertaken in their immediate surroundings.

Poor growth, limited blossoming, and significant epicormic growth and 'dead-wood' recorded over the last five years were all evidence the trees were in urgent need of help.

"Investigation clearly showed severe compaction of the soil around the trees, due to the popular use of the area as a carpark, so the council worked with several contractors to put in place a remediation plan that would give the trees their best chance of recovery, while retaining the car parking spaces beneath them," Gill said.

The work was undertaken in several stages over four days. First, the carparking area under the trees was cleared of its gravel and radial trenches made within the root zone of each tree.

Roy Hollister of Complete Tree Care Ltd used an air-spade to excavate stones and soil from around the roots without damaging them, expertise he gained while working as an arborist in the United States.

The trenches were lined with humates specifically formulated for the site by Tuturu Products Ltd, then refilled with the air-spaded soil.

The whole area was next covered with an interlocking 'honeycomb' grid, made of recycled plastic, designed to protect the tree root zones from compaction, while allowing good circulation of nutrients, water and air.

Layers of mulch and gravel were then applied to provide a totally new carparking surface, and mulched gardens planted around the tree bases, planted with native grasses from Bushlands Trust.

"The crew also performed an unofficial archeological dig that uncovered a two shilling coin, a thruppenny bit, two pennies, a faded GayTime icecream spoon and a mystery looped wire," Gill added.

"Once the work area was reopened to the public, several locals praised the new carpark look and said they looked forward to seeing the pohutukawa reviving in the near future."

- Northland Age

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