hydrated lime raises PH, you can get it at big chain "mart" type stores with garden sections, I usually boil it in to water (otherwise you'll have to shake it up and test it every time which works fine but...) I've had the same box of it for years and haven't used more than a few cups. But my water is ph 6.8, so if anything I usually need to lower PH (make acid)
high ph is alkaline, low is acidic. vinegar will lower ph (I use acetic acid instead very very sparringly BTW)
4x5 Reviewed by 4x5 on . PH up? Rawr, I can't search for the phrase "ph up" simply because it's too short, SO I'm coming to you for help. Apparantly, the water I've been giving my plants is too low causing a nutrient deficiency, so I need something to raise it! (lucky me, I bought a bottle of PH down but not up!) I've checked the faq as well as tried to search my ass off. I might have overlooked something, I remember hearing vinegar being used but I can't remember if that would make the soil more alkaline or acidic. Rating: 5