potting mix pH for container garden

Asked May 27, 2015, 10:25 AM EDT

After on-line searches and local nursery advice, I chose to use 80% peat moss, 20% perlite with dolomite lime and a tomato fertilizer. I wanted the lime for calcium. I also wanted media pH between 5.8 - 6.8. Using nearly equal volumes of the mixed media and distilled water, I measured pH = 4.3. With the same method, a commercial mix measured 5.9. I'd hoped to save money using materials I already had, but 4.3 is too acidic. I expect that the lime won't raise the pH quickly enough to feed the young plants.

So, 1: can I fix the home-made mix? and 2: if not, where in the garden can I use that mix?

Arapahoe County Colorado

1 Response

Early on, the pH will be low. Blending the lime will temper it and raise it up. This happens more quickly than you realize. Give it a shot. You might also add some vermiculite if that will ease your anxiety.