So it seems there are some mixed opinions here which I always entertain I guess what I'm trying to get at is some strains don't do as well in FFOF when they are seedlings,slower start,browning of leaves,etc but some love the hotter mix so I figured reuse the soil for the strains that don't like FFOF at first seedling then transplant into Fresh FFOF that away they get going good in less of if any hot mix but the transplant will kick in the nutrition and AZOS I use, and to PAPA Canna i have strains that do very very well in FFOF and some not same bag of soil that's why I figure it's the strain not the soil,but hey I'm always learning something,which is good