Growing weed outside is all about horticulture and

[Terrapin Station]

. . . growing weed in indoors is all about botony and more so microbiology.

Looking at my outdoor plants today I'm 100% convinced of this now. No comparison!

 

[Chrondocious]

I use the same theory of approach as far as soil. I always seem to forget how much more support they need outside though. Mother nature is unforgiving.