Take what it says on the box and divide by 4. Then gradually work up to full strength of the directions.
But miracle grow sucks.
stinkyattic Reviewed by stinkyattic on . when to use fertz This is my first grow past the seedling stage and I was just wondering how long should u wait to start using fertilizer. I am using miracle grow 24-8-16. Also what strength should i start using it at. Rating: 5