hey cwesto -

You r problem is usinf pro mix "HP"...it has a range of ph, i believe, 5.3 to 5.7 out of the container it was sold in (somewhere around, not #, but forgot) use the pro mix "BX"... it has a range of 5.5 to 6.3 out of the box i believe...

just add some extra perlite and you got yourself some "HP" using "BX"... you should be adding extra perlite anyweays so why not just get "Pro mix BX" and add some perlite, and what do you konw, you got some pro mix HP ( with added vermilculite, dont like this, but its better than havinf ph issues... never had problems with BX, but with HP had promblems.... hope this helps!

( i rerad this off a fourm, and tested myself what the soil ph waas on these hp and bx right out of the paltic containers they were housed in)
saltypimp Reviewed by saltypimp on . Why has my Ph droped? I grow in soil, righ now i am in 2 gal. pots. I have 6 plants that are about 25-26 days through veg. I have been using only growbig mixed with rested tap water. I started at 1tsp/gal after 1 week of veg have worked my way up to 2 tsp/gal. My plants look healthy and all, but today when i watered and tested runoff Ph almost all of my 6 plants tested at around a PH of 5.... Why is my Ph droping?? I was thinking possible salt build up, I heard that FoxFarm products tend to create alot of Rating: 5