How do I know when my plant started to flower if I'm growing outdoors?

Hey Guys and Gals,

I have a collosal White widow growing outdoors and she is looking great but I am trying to figure out how many more weeks of flowering I have left till harvest but it's hard to tell because I have no idea exactly when she started to flower since it is outdoors. I don't have any pics but she's been growing outdoors since May and it is now just past mid september so I was hoping someone could give some kind of an idea of when she would be ready to harvest.

Any advice would be really helpful

look at the trichomes. does she look ready or know. you dont pick when it has flowered for a certain amount of weeks you pick when it is ripe and mature. and pics would really help to tell you

Since different strains and conditions affect how long plants flower, I don't think it's real important to figure out when it started. As mcpurple said, it's where it's at NOW that matters