My brother grows giants veggies (has held a few world records) and worked closely with the person who grew the largest ever in North America.
The most important thing is the Seeds (genetics). Even with ideal conditions you won’t get a true giant with regular Atlantic giant seeds.
Other important things are soil type, watering, pruning, fertilizing and temperature. Halfway between the North Pole and equator is ideal, not too hot or cold, which just so happens to be Minnesota.
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