@blinry Sounds like my experiments right now! This mix sounds very close to "Mel's Mix" which is used for square foot gardening. 1:1:1 vermiculite : peat moss : compost. But you can switch the vermiculite with perlite for better drainage, and peat moss for coconut coir. I decided to try it when I found this post from someone who tested it against some others: https://journeywithjill.net/gardening/2020/03/09/3-raised-bed-soil-mixes-compared/
@th @holly Yeah, if I were a worm, I'd also spend more time looking at the Amstel, compared to eating your kitchen scraps! :D Maybe that's why they're so slow.