I don't think it's too late. as long as you get on it. I have some right now that has been cooking for about a week. I am also using ROOTS soil in a few containers with the super soil on the bottom. I wouldn't use any extra nutes through your grow unless they start showing a need for. which most likely they wont with the ROOTS and the SS in there. In the rest of my buckets i used my own base soil mix instead of the ROOTS. It's just 50% peat 25% manure and 25% mushroom compost with some worm castings thrown in if you got em. way cheaper than ROOTS and it's the mix that has been used for 10+ years now with great results.