I have been adding a little vinegar occassionally with the water.
The area they are in gets lots of rain run off and is very well drained. I think my problem with their health is the heat. The leaves have brown patches on the tips at times. They have not grown that much but otherwise seem OK.
There were a few blueberries already set on the O’Neil’s but the birds got those before I could pick them. They have been doing the same to my strawberries. I fixed that with netting.
I hadn’t thought of vinegar with the water. LOL. Around here we don’t ‘think’ about making our soil acid. Mainly concerned with keeping in moisture while it’s so hot and dry and keeping down weeds. We got nearly a yard of pine mulch from a neighbor who had stumps ground down. This weekend’s chore is spreading it around the blueberries, raspberries, roses and maybe cherry bushes if we have enough.