I agree with the promix, I have never had an issue with gnats. (I have used many different types of promix, while not the cheapest my favorite is their ultimate organic mix)In my experience, and i have used many different soils, go with pro mix. The way they package it, the soil is sealed from any contaminates. I have never had an issue with any bugs in pro mix, ever. I stopped using fox farm and roots organics because of this.
Note: roots organics is my favorite soil, but have moved on to pro mix due to the gnat issues.
Goodluck
Not long, it has little additional nutrient unless you amend it. I like it because you can control what you feed. it's sort of like drain to waste hydro by hand watering. Obviously seedlings wont need much of anything for the first few weeks, and rooted clones for about a week.How long will my plants be good in promix HP before needing to add fertilizer?
This is what I want to try. Finally got the wifey to agree on the added expense! (She gets so pissed at me cause of how much my hobby costs!!!)I dont get bugs in TGA base soil or super soil.