I agree
@AJrexxx a long veg time is certainly one requirement. Dutch Passion do a few XXL strains that go a bit longer.... Daiquiri Lime, Glueberry OG, AutoUltimate and one pheno of Night Queen for sure (cheers
@DCLXVI for the shout out Bro!). If you can still get them, Dinafem's Blue Amnesia and White Widow XXL are huge yielders too.
I also believe ANY fiddling from germination through to week 4 will stunt the growth, so no paper towels, topping or even LST.... just staking out to allow full light penetration, and some leaf tucking.
Where I've fallen short on some of my big ones is feeding. In coco I could have fed 3-4 times a day but alas only manage 1-2 a day, but more feeds would have made them even bigger.
Lights are also important, a minimum of 400W LED Skyline, but my big ones have often flourished under 800W or more LED.
So
@MikaelAndréasSöderberg good luck mate, I reckon it can be done, and as you say... DWC, plenty of light, the correct pheno that can handle and use all the light, a perfect dialed in plant, grower and enviroment... you WILL get over a kilo. Tag me in whatever you do Bro.