Farm forestry had been supported in the 1980s, but investment had since declined, which Mrs Pedersen said seemed out of line with the need to plant trees to counter carbon emissions.
"Why isn't there more publicity and enthusiasm for tree planting?" she asked.
Near their house the couple have about a hectare covered with trees grown from seeds and young plants they were given.
There are conifers, oaks, maples, magnolias and many other trees which caught the couple's fancy over the years.
The farm walk will take people out to production woodlots and Mid North Farm Forestry Association president Peter Davies-Colley will talk about prices Northland farm foresters are getting for trees they harvest.
Mrs Pedersen said son Matthew, who works for forest management company PF Olsen, would also be on hand to offer advice.
Matthew had contributed to the farm tree planting as a boy, and Mrs Pedersen said his sister Justine - who had planted her own patch of pines on the farm - had gained a forestry degree before heading overseas.
"Farm forestry has been a family thing all the way along," Mrs Pedersen said.
The farm at present runs 200 rising yearling bulls, 100 rising yearling steers and heifers, 120 ewes and about 170 lambs.
John Pedersen said a tree line which had blown down had been turned into timber used on the farm, but harvesting of the woodlots and plantations was only now "about to come into the pipeline".
The Pedersens won the Northland community conservation and environment award in 2009 and took the 'Land of Life' section of the 2010 Northland Ballance farm environment awards.