One of 6 plants not flowering, please help (PICS)

Hello everyone and thanks for stopping by.

This is my first grow, and i have really enjoyed it thus far.

Growing under 1600W mars hydro LED
COCO medium w 25% perlite and hydroton in the bottom
GH flora series used for nutes along with CalMag+ every feed
Feeding " 550 PPM and P.h 5.8
RH " %50 for flower
Not using Co2
lights were flipped to 12/12 on 08/03 (more than a month)

In the pics all plnts are at the same stage of flower. the plant that is the problem is an Arjans Haze NO 1 the rest are bubblegum and kush.

As you can see from the pics, the under developed buds are still stretching whiles growing hairs and leaves...

Could it just be that this plant has a sup slow flower time? its just so strange that it is so far behind..


Any help would be appreciated

you can see how much taller she is! This was when i flipped them to 12/12 and some progress along the way

Minimum 10 weeks for haze's. Super Silver Haze I run to 14 weeks.

wow ok, thanks boilingoil, i was planning on getting my second run in when they finished but looks like ill have to wait a few weeks, i had some mite issues so i want to really clean the room after this round flowers