How much cal mag do I use when feeding autos?

Grow Support Autoflowers
21

Hi DarthVaper,

RO or Distilled water is also a great option, and often even better depending on the area.
That said, tap water in most areas should be sufficient :slight_smile:

22

You can use calmag with every watering except:

  • Right after you plant the germinated seed up to the establishment of a few leaves.
  • At the end when you’re doing a non-nute flush.