You might not ever need to flush if you water between feedings. I saw that promix at walmart. Scary looking stuff @ 90% peat. Some of them moisture control soils also have little watering retaining blocks that work great for house plants but not good for weed. I hope you added a ton of perlite.
Decades ago I used something that had the moisture pellets. It didn't work well. Glad to see it works. Now we can quit buying the overpriced promix hp or bx.
Decades ago I used something that had the moisture pellets. It didn't work well. Glad to see it works. Now we can quit buying the overpriced promix hp or bx.