When to transplant?

A 3 gallon is more then enough for a autoflower. I would transplant now. In future it is best to start autos where they finish. Helps reduce any stress. Good luck and happy growing 🌱🌱🌱

I always try to transplant when the 2nd set of leaves pass the outside of the planter. If you wait till the roots start to circle around the cup instead of still reaching down, it will slow growth a little. You want to transplant before they hit the bottom of the cup. If the roots are already circling the bottom then cut them open just a little so there hanging down. I get the best results this way. I go from a solo cup ( my starting method in soil ) straight to a 5gal fabric pot. Or if I'm low on soil and 5gal pots I'll do a 3gal. Then transplant to a 5 later