Haven't done too many grows and am wondering; can you re-use the soil after a grow or should I start with fresh every time?
I know there are people who re use soil. May need to ammend it with some stuff to perk it back up if you want some micro nutes but otherwise could be done.
I used the same soil, no re amending it for about 2 full grow cycles but then ran into serious problems on the 3rd. Had to spruce it back up and now all is well again. If you have a small grow there is no reason not to use fresh soil every time. Large grow that is much more difficult.