outdoor newbie who need experts help

ok so i have 4 potted plants(outdoors only) i stay in los angeles,ca and its already october. ok first off my 2 oldest plants which are now at 9 weeks have began to flower im guessing becuase the middle stem has opened up and white hair are forming all over the base. now i kno these are females but my problem is that they are only 7inches tall at the most. How much could it possibly harvest. and why is is it so small? laCK OF SUNLIGHT? ANY HELPERS BECAUSE I CANT DO THE CFL LIGHT THING RIGHT NOW.
 
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