rhodes68answered grow question 4 years ago Soil? Coco? DWC?
Assuming soil it depends again on what kind of soil the hotter the soil the longer before you feed.
The cliche is low levels at second set of leaves, think 5ml/gal is a full dose so something like 1ml/gal of Grow Big and about 3ml/gal of Big Bloom to start and judge from there.
In coco DTW any time after first set of true leaves same sort of idea
No diary so just guessing.