Yeah when I was doing soil would feed every third watering. You really need to get 15 to 20% runoff and don't let the plants soak that back up. I can't remember what kind of Cal mag you're using but most of them have nitrogen and I got a feeling you're going to give your plants way too much nitrogen at that level.
Where I'm currently growing
Where I'll be Nov 1st
My cal mag does have Nitrogen but I have come to realize that they needed more nitrogen the whole
Time...
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