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Some of the engineering would certainly be done with gene modification technology

Ok, thanks!
As you may guess, the only 'plant engineering' that I know (as ecologist) is the natural one. The associations that plants do between them in a natural way and that can be repeated in similar environmental conditions.

Well to expand a bit, a combination of natural (traditional) breeding, assisted AI directed breeding as well as genetic editing will be used together to produce the desired organism.