i agree with this guy here ^^ Epsoma have good organic ferts loaded with life.i would not just leave ph "to the gods". check it easily with a soil ph meter from home depot and then add organic ph up/down like Espoma brand lime for up and acidifier (sulfur) for down. otherwise, your water, nutes, and soil buildup will probably shift the ph over time.
Espoma products all the way!!!!
http://www.amazon.com/Espoma-GSUL6-Soil-Acidifier-6-Pound/dp/B0063ZDQ66/
plus try this...
http://www.amazon.com/Espoma-PT4-4-Pound-Plant-Tone-Organic/dp/B001R4OJRS/
(no i don't work for nor receive compensation from Espoma)