Yes, Mauna Loa is the biggest land mass on earth and growing, plenty of room to farm Kava. Tonga on the other hand is the ,smallest in terms of land mass, Kava growing nation. When you're limited in space and resources you have to get creative. Another reason IMO the Tongans were the most technologically advanced country back in the day, they were forced to be. The way we plant Kava in Tonga is very different than Hawaii, the cultivating Kava farming techniques passed down from my grandfather we're engineered over time to maximize yield from every Kava plant which makes sense when the island you are living on is only 30 sq / miles
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