Are they all 3 autos? By sorry im following a few differnt journals and have been out of town. If they are all auto you should put them in a 3-5gal container ASAP.
Both autos i grew had mutiple roots growing out the bottom of a rapid rooter with in 48hrs of popping, so in 6wks they should have more roots then a solo cup can hold. I harvested my last 6 w.w.a’s all between 75-80 days total. Thats about 8-9wks. That would mean that 6weeks is more the 3/4 of the whole autoflower life span.
My personal opion is put them in a bigger container and start more autos dierctly in the size container so they never get transplanted. Layer the medium so the new seedlings roots start in a neutral or cool seedling mix, then into stronger, “hot” ,rich layer. Make sure they have lots of drainage, bc over watering an auto just once or twice can drastically reduce your final yeild.
If you grow reg photo period plants(not auto flowering) you could start them using the solo cup and transplant methods. But the thing with a non-auto is you can controll how long to veg them so if you have an issue it doesnt effect final yields as much bc you can make up for it by allowing to grow more in veg before you force her to flower by switching your light cycles. An auto flower has a predeterminded life cycle and if it is stunted you loose that time of its life and the final yield is drastically effected
This is a 2wk old white widow auto flower its about 15" tall for comparisons in size.
Hope this helps. Good luck im going to tag some others see what they think, get the pros on it.
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