You’ll get tons of responses! Dr earth, Stonington blend from coast of main, bas… those are probably the places I would start! All super solid. Most are omri listed.
Down to Earth 4-4-4 and 4-8-4 dry amendments is all I’ve ever used my whole life. Works amazing outdoor, works amazing indoor. You can use just the 4-8-4 1tbsp/gallon from start to finish. Mix it in the soil before veg and top dress a week before flower and you just water it.
Edit: it’s also extremely cheap. Less than $20 for a 5lb box. OMRI listed. Even the box is compostable
Dr earth is best. I use with a brew of worm casting tea and also use grass clippings and yard weeds to soak in rain water or lake water as free fertilizer.
You will get into the swing of things and develop brand loyalties yourself.
Im lucky to work at a nursery shop and just grab what ever is on sale, new or given to me for samples.
I have never had a plant ask for a product by name.
I’ve noticed my casting tea takes about a week to start doing anything nitrogen wise, then lasts about a month after last feed. Dr earth takes over by itself after veg for me. Depending on how plant responds ect.
Are you in Canada?
If yes I would recommend Gaia Green for a dry ammendment to premix your medium.
Also great for top dressing.
Maybe available in other countries by now I’m not sure.