rhodes68answered grow question 5 years ago It is the perfection of the art of growing Autoflowers to get them to veg longer given their very favorable veg to flower ratio.
Growers are just beginning to understand the mechanism of autos flipping.
Changing the spectrum on an auto may make it flower due to stress but nothing else as it is triggered, not just timed.
Some sativa genes also stay in veg a bit longer.
So far the best advice on keeping autos in veg is ZERO STRESS.