I wanted to add to @Ocean answer. If you are in coco you can use full strength from start to finish. If you are in some kind of amended soil then you would wait to start Jack’s after your nutrients in soil are starting to get used up. I currently use it in soil and will wait to start adding it until after my ppm’s drop down to under 950. @AfgVet is using it in Coco. Here’s a link to her journal. If you want to see what kind of results you can get with Jack’s.
If you want to see results in soil let me know and I’ll tag you on my journal.