[2] Plumtree began his career with Wellington in the NPC, and played for the Blues in Super Rugby.
[7] Plumtree made his first Scarlets appearance in a preseason friendly against the Barbarians, along with fellow new signing Ioan Lloyd.
[10] On 3 July 2023, Plumtree joined the Wales squad for their World Cup training camp in Switzerland.
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.
[6] Taine and his brother Reece both attended Wellington College and played for their rugby team.