IS IT NECESSARY TO CHANGE OUT THE SOIL YOUR POT?? dont want to if i dont have to!

i have farm fox soil in a medium size pot- attached is a pic. its about 1 month and a couple weeks into veggy going to start flowering soon- not sure if i need to replant with fresh soil or if its OK how it is. Or what factors i will need to know to determine that..

If you are going organic, or you are using soils specialized for different cycles then yes you need to put it in new soil. If not, then you just want to make sure your roots don't get root bound. I would say the size pot your in will be fine if you are flowering soon. If you are going to give it like 2 more weeks of veg, then I would go up a pot size or two, to make sure you have enough roots for the stretching in flowering. The more roots, the better of a yield you can get.

Bigger is always better when it comes to pot size.