Third Age Glorantha has three general tea growing areas:
Kralorela (mainly the easternmost islands, such as Zon An and the small one east of Fanzai)
Seshnela (the western parts of Noyelle and the eastern hills of Nolos)
Umathela (predominantly Cerngoth)
There is also mention of a Tree of Life tea brewed in Laskal, though strangely brewed from the nuts rather than the leaves of the Tree of Life enslaved by Ompalam there. The Jrusteli are said to have imitated that Tree of Life and started to grow such tea in Jrustela.
Now when did the Jrusteli first contact Laskal? It would be fun if the Tree of Life enslaved by Ompalam would have given birth to the Tea dryads and their Runners imported to Jrustela, and from there distributed to Seshnela and Umathela as well as to the False Dragon Ring's Kralorela. That would require an early expedition on Waertagi ships, though.
According to the Guide, tea cultivation in Malkioni culture originated in Jrustela in the Second Age and was brought to Seshnela and Umathela from there. Interaction with Kralorela under the False Dragon Ring and transplanting an entire Kralorelan city may have played a role there, too.
I would have expected the uplands around Temple to have been a major tea growing area in Old Seshnela, with the Noyelle plantations just an outskirt area of that.
I wonder whether there are tea plantations in Old Seshnela and Jrustela that have gone wild and are now under the care of aldryami gardeners. While tea plants usually are cropped at hip height, they can grow several meters high.
As an evergreen leafy plant growing in brown elf habitat, I wonder whether there is a dedicated type of Runner associated with these now feral tea plantations.
As an aside, we don't know anything about Runner procreation. Are they following the Green Elf model of sexual reproduction between males or females, or are they more similar to yellow (or red) elves that result from mating between the male (only) species and associated dryads?
Those monkeys harvesting the tea on Zon An might be used in imitation of Tea Runners doing the harvesting in elf forests.