first time grow plant is getting to tall help and what nutes do i use?

Hi its my first grow. My plant is in its first week of flowering I was wondering what nutes to give it? And also its showing so much growth in past two days gettin to tall how can I keep it from outgrowing its box?

In flowering you can see double, sometimes triple growth. If you vegged until 2 feet then flowered by the end you're looking at the possibility of a six foot plant.

use fertilizer higher in potassium and phosphorous and lower in nitrogen (though not entirely non-existent) and you should be fine.

If need be, gently bend and tie down the branches to keep height down. be very careful, VERY CAREFUL.

Make sure the lights are close enough so that they aren't getting too tall from stretching but growing. And on top of the nutes you are gonna give it I would give it some molasses, it's organic and adds to a better overall taste (not a chemical taste).