Jeremy Thomson, a farmer and riparian planting expert, accompanied the Prince on a drive to an area of established riparian planting on the farm.
Mr Thomson said Prince Charles asked questions about the types of trees planted and if they had commercial value as well as environmental.
Prince Charles had a cup of tea while talking to dairy representatives at the farm. The tea was made by Bianca Richter and Lynne Payne, who both used to work at the farm.
"We volunteered to do this today," said Ms Payne, adding they were nervous when it came to making the tea.
"We used two tea bags of organic earl gray, and served it with a little bit of milk and then a good teaspoon of organic honey."
Ms Richter had the honour of taking it to the prince and said her hands were shaking. "He drank it though, so it must have been okay."
Prince Charles was then invited to plant a native kauri tree to mark his visit.
Watched by pupils from Tikorangi school, the Prince planted the tree and spoke to the children.
"At least you don't have to go back to school after this," he told them, before asking if they had homework.
He expressed surprise when they said they didn't.
For Camdyn Johnson, 5, meeting a "real live prince" was very exciting, although "he wasn't wearing a crown".
Prince Charles then spoke with members of the small crowd who had gathered at the farm fence. He took particular interest in three horses who stood amongst the people.
"A European horse," he commented on being introduced to Buddy, a warmblood.
On being told by Buddy's owner Rod Jupp that the horse was quarter Clydesdale, he commented "that's why he is so big and strong".
Mr Jupp said speaking to Prince Charles was a great experience, adding "he has a good sense of humour, very nice to talk to".