Well, its usually better to use new soil....

But if you think about it the new potting soil you buy, is also "used soil" in some way....it just has been enriched whit stuff....

I personally have used old soil from my prev. grows without any problems, but mixed it whit other stuff(potting soil, perlite,etc)....
In my case the soil doesn't need to have any nutrients, i feed my plants whit liquid nutes....the soil is just a "neutral" medium.....
zebulon Reviewed by zebulon on . Used Soil Determine Sex or Alter Sex? Maybe dumb questions but here they go Planted 14 seeds, 13 grew and now at 12 weeks 1st off plants sexed with 24hr light... i never turned lights out. is it possible to use the soil from the now dead male plants? they still have roots in them... if i use this soil for my plant that are female, will this alter the females or make them hermies or will everything be ok? thanks all:thumbsup: Rating: 5