Ok, I am not a blueberry farming expert by any means but my understanding of the principle is that if you burn the fields regularly the there is only a limited amount of fuel on the ground and thus the fire does not burn hot enough to dry out and burn any live, green bushes. I do not believe this process destroys all parts of the plant above ground level. The key is, don't kill them. I do not think it is possible to cut them off where the stem meets the ground (what I meant by ground level) and not kill them.
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