Quote Originally Posted by cheapsunglasses
Well I put them in 12X12 pots. gave them plain RO to start. If I wanted to give them a little more CalMag down the road, like others suggested what route should I take? Lime? I will do a water run off test next watering.
There's a product called Calmag Plus, and I've heard a lot of people say they really like the Botanicare line... though you can probably find one from another manufacturer that's practically the same product. If you've mentioned it before I apologize, but is there any reason you can't use your tap water? Tap water generally contains enough usable calcium and magnesium where you wouldn't need the extra supplements.

I wouldn't add lime unless you're needing to adjust pH. I don't know much about Miracle Grow soil, but I imagine lime may already be a part of the mix to act as a pH buffer.