At more than 55,000 acres, it may be Aotearoa's smallest national park ... Visitors can also explore the park by waka (a Maori canoe) while learning about Maori culture with Waka Abel Tasman.

Heather's expansion into the national park also appears to be having an effect below ground, said study co-author Darby Moyle, a Master of Science student at Te Herenga Waka. "The roots of the red ...