SheGrowsanswered grow question 4 years ago Depending on your soil.. if your using a hot soul I would used very sparingly...I used FF trio on my first grow, but I used 1tsp per gallon, and I did a 2/2 schedule ..twice fox farms water, twice plain PH'd water....I used them with caution, and never had any issues with nute burns or anything whatsoever. Good luck...