Does high curcumin turmeric like Lakadong keep its curcumin if grown outside its home belt?

This is an important and often misunderstood point. A high curcumin variety carries the genetic potential for high curcumin, but the curcumin actually expressed also depends on soil, altitude, climate and management. Lakadong reaches its famous high curcumin in the cool Meghalaya hills, and growers report that the same rhizomes grown in very different warm plains soil often test lower, though still usually higher than ordinary local turmeric. So it is realistic to grow it outside, but do not assume you will get the exact headline curcumin number. The honest approach is to plant a trial, get your harvest curcumin tested in a lab, and then talk price with oleoresin buyers based on your real tested figure rather than the variety reputation alone.