"We feel like the importance of Maori healing plants has been lost," she said.
Kristin, 18, said the tea was made from manuka leaf, kawakawa leaf and Kerikeri orange rind. The ingredients, chosen for their health-giving properties, were dehydrated, grated and put into tea bags in the school's commercial kitchen.
Billie, 17, said the tea was sold via outlets in Kerikeri, Mangawhai and Wellington. They hoped to keep the business going next year though they were all heading off to different universities.
About 50 teams are taking part in this year's YES programme. On August 19 they will showcase their products at a trade fair at Kerikeri's Packhouse Market, and on October 20 the overall winners will be announced at an awards dinner in Waitangi.