Is cal mag needed

Nutrients
1

I’m growing in a hydro grow box. Using reverse osmosis water. Do I need to add cal-mag to my flora series nutes which include floramicro which has some calcium and magnesium?

2

Cannabis heavily uses both calcium and magnesium.
I would recommend using both for best results. Some companies calcium/magnesium has extra nitrogen, and be aware of the change in NPK ratio when adding it to your nutrient schedule.

6 Likes
3

Thanks!

2 Likes
4

I like using cal-mag throughout the grow.

4 Likes
5

I like Cali Magic it’s half the Nitrogen than regular Cal Mag. Like Covert mentioned cal mag will raise you ppm’s. I get a 300 ppm rise being conservative.

2 Likes
6

Im organic but still supplement with cal mag when needed…

5 Likes
7

I use this nitrogen-free calmag from TPS. They have smaller sizes than what is shown in the link, LOL, like a pint for $17.

1 Like
8

thanks all for your feedback