Ph too low in Blueberry pots
I'm starting to see some yellowing on the new growth of all my new plants from FHN so I decided to check some of the pots ph. I put a plate under the pots and watered several of the plants showing the most yellow on the new growth. Every pot I checked had a ph between 3.1-3.8!!! I know I can flush the pots until I get a higher ph reading but are there any other ways to bring the ph up in potted plants??? I really don't want to use tap water to flush unless I have to. My tap water runs 8.5 on the ph scale and it's chlorinated which could cause other problems in my soil. Would flushing with rain water have very much effect on raising the ph?