Do I need Cal Mag if I am using Pro Mix?

Yes, but you need it in the form of powdered dolomite lime.

This not only supplys cal/mag, but also keeps the pH in the sweet spot of 6.5-6.8.

Peat based mixes especially, need lime added.

DD
 
When you say it keeps the ph at a sweet spot does that mean I wouldn't have to ph my nute solutions because I am using the cal/mag?
 
No, the lime is mixed into the promix and keeps the soil pH where it should be. It also supplys cal/mag to the plant, no need to add it to the nutes.

Still should pH nute solution to 6.5 before use.

DD
 
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