Need help with Flowering.

Hey everyone. I'm in upstate New York and I've got an outdoor plot with two 6 footer LA Women, a 4 foot Mango kush, a 3 foot white widow, a 5 foot DJ short True Blue, and a 3.5 foot cheese....all feminized, I need help inducing flowering and knowing when to start adding nutes, Obviously this is my first grow and first harvest and I really don't wanna lose out on all the goods. Any help would be greatly appreciated. Thanks all, for reading and for your help.

P.S. How often should I visit my plot? and what threats should I keep wary of? Do my babies need any kind of essential upkeeping and how will I know when to Harvest?
 
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