In places commercial blueberry plantings are grown in raised beds of organic material, mostly sawdust I think. So, your mix isn’t too high in organics. The pH may still be to high but acidifier should take care of that. I have killed them with too much acidifier.
I’ve got 4 BB plants going soon. I’ll be facing the same issues. Only out here it’s mostly no rain and highly calcareous water.
Thank you for your knowledge!
Actually, concrete and similar will make the soil alkaline, not acid. Too high ph/too alkaline and you get nutrient lockout for a lot of plants. Blueberries and concrete structures are not good friends
Oh interesting. I thought foundations slowly acidify which is why foundation plantings should always be plants that tolerate a lower pH.
Just speculating here but with limestone being a large ingredient in concrete I would imagine it is alkaline and not acidic. I would think saying that a foundation acidifies refers to the foundation becoming more acidic, not giving acidity
Yes, that makes sense. I hadn’t thought it through and questioned everything I read 2 years ago when planting my foundations. Most things on the internet talk about needing acid-tolerating plants around them. Crazy.
Well, I don’t have another place to move the 6 blueberries. Maybe a 12” wide piece of pressure treated or cedar wood sandwiched against foundation to cover the area I’ve amended?
Any effect of the concrete is very localized. Like right next to the concrete. An inch or two not a foot or two. The acidifier will protect your blueberries.
If concrete were acidic the rebar in it would corrode away in nothing flat and the concrete would fall apart.
Awesome. Thanks.
Mine are doing well in shredded bark mulch (pathway bark), peat, and pumice mulched with fir sawdust. Perhaps you can replace peat with extra bark.
All of the ones physically with me are in a pot right now. I have some plants planted at my mom’s farm that i may move to my new home after i get everybody situated.
They do amazing in pot culture. Some of mine have been in pots for over 8 years now.
@Eme, I’ve been growing blueberries along a fence with a concrete retaining wall and foundation under it for over 30 years. Initially, I didn’t modify the gravelly and sandy soil at all except to apply 21-0-0 and Rhododendron fertilizers. The plants grew slowly and weren’t very productive, but they all survived quite a few years, providing small crops. But after mulching the bushes with wood chips and applying sulfur to lower the pH, the plants really took off and became very productive. The plants are all in the middle of a 28" wide bed with no barrier between the bed and the concrete retaining wall; so they should work just as well next to a house foundation. I would recommend just monitoring the soil pH and adjusting it with sulfur to keep it within the recommended acidity.
Blueberries
Thank you for sharing your experience. I’m hopeful
is anyone adding elm sulfur to their container bbs? i realize its a long term way to lower ph because it takes microbes to convert it to sulfate. there is a difference between adding sulfur to in ground plants and those in containers that start with a comparatively low microbe population using “sterile” media. even though its not really sterile. so maybe it takes longer to lower the ph in containers 
im going to be using water soluble fertilizer + osmocote. not a special acid fertilizer like jacks acid. would it be enough to use water thats ph adjusted here? i have ph down from my hydro system.
If it’s not specifically for acid loving plants then the nitrogen isn’t the kind blueberries can use
ive never heard they needed special N. i always thought they needed lower ph to get adequate Iron 
You need ammonium and not nitrate like in most fertilizers
jacks acid, proven winners “for flowering plants” and osmocote, all use “ammoniacal” nitrogen.
Ammonium sulfate, 21-0-0, is the nitrogen fertilizer used by commercial growers around here for blueberries.