cali og kush/haze

This is my first serious grow. I am 6 weeks in on a beautiful Cali OG plant. 18/6 cycle . She’s about 2 feet tall. The fan leaves are blue and green. She is starting to show white pistils already. My first question is , is this a sign that I should start to flower? My second question , I am...

Cali OG # 2

Cali OG # 1

Cali OG # 2

Cali OG # 1

GC # 1

Someone gave me 4 hydro durban poison plants..I only have used soil and don't know what to do with these..I have put them under leds...do hydros always look this thin..my durban poison and Cali O are pictured here second..what do I do with the hydro durban poison?

Here are my 8 week cali og kush/haze 1st pic and durban poison 2nd pic. my other grow was auto so I don't know with these when to switch to 12/12. I only put them outside when the weather permits like today otherwise they are in a tent under led's