New Zealand U20 Plumtree was part of the
New Zealand U20 squad for the
2019 World Rugby Under 20 Championship.
Wales On 3 July 2023, Plumtree joined the
Wales squad for their
World Cup training camp in Switzerland. Despite representing New Zealand U20, Plumtree qualified for Wales via birth, and was not bound to New Zealand. Plumtree made his debut on 5 August 2023, coming off the bench for Wales in the first test of their
2023 Rugby World Cup warm-up matches, against
England. Plumtree missed out on selection for the final squad due to a shoulder injury. On 4 November 2023 Plumtree played for Wales in a friendly against the Barbarians, coming off the bench and scoring a try. A recurrence of a shoulder injury ruled him out of the
2024 Six Nations Championship. He featured in the second test of the
2025 Wales rugby union tour of Japan, providing an offload to allow
Dan Edwards to score and secure Wales’ first win in 19 tests. Plumtree was selected for the
2025 end-of-year rugby union internationals. He came off the bench in the second half in the match against
Japan. Plumtree started against
New Zealand, and received a yellow card in the second half for ill-discipline. Plumtree was named in the squad for the
2026 Six Nations by
Steve Tandy. == Personal life ==