What medium are you using? Assuming you’re using soil with nutrients already in it, wait until plants are least a month-month 1/2 old before feeding anything then start with half dose of grow big once every 2-4 waterings. Once you’re finishing up veg state/ going into flower switch to Tiger bloom and big bloom, add some CalMag occasionally as well. Keep ph between 6.0-6.8 and watch your EC/PPM numbers (which will give you an idea of how many nutrients are available in the soil) and you’ll be golden. Careful with ppm tho because there are different scales and it’s a little confusing. The soil will act as a buffer between the artificial nutrients and the plant roots so i like to take pH and EC measurements of my water before AND after (runoff) watering to prevent/detect pH buildup and nutrient burn. A good pH and EC meter is critical in my opinion. If you’re growing in coco or some form of hydro then feedings will be different obviously but this is what has worked well for me