Topping Mephisto Double Grape at Day 15

Professor Autoflower - Double Grape

https://www.theweedtube.com/video/h...isto-double-grape-autoflower-at-day-15-109361

 

[RYCBAR]

How on earth do these guys make auto's grow so quickly so early on?
Don't think ive ever had one that huge expect back in 2016ish when 50 day strains were common.