hey toka I grow outside and I reuse the soil after I amend it but I have noticed a marked difference between new holes and old holes with amended soil , new holes doing alot better, I just nuted my outside grow to help with the bloom stretch so the soil does get depleted, Im planing on using kind soil with autos inside, I will not reuse the soil but add it to my veggie garden, at the price of kind soil $85 for 25 gallons enough for 5 plants start to finish . I probably spend $85 on nutes per grow anyways. inside with photo plants I use coco choir and I reuse that all the time