No ,they practacly double the root size...they will fill all the space they can find!So I suggest transplanting before flower into double the size of that pot(10 gallons)...you do know that the plant grows double or more,hieght wise, in the firt two weeks of flower?Transplant and you'll end up with some huge plants and a fat yield...just hope the hieght isn't a problem.If it is may need to do alittle supercropping>If you leave it ,it will get root bound and die during flower!