North American Fruit Explorers mailing list at ibiblio

[Alan Haigh <alandhaigh@gmail.com>]

They?ll grow just fine in
a high pH soil if they have sufficient magnesium and lots of organic
matter. I?ve seen huge blueberry harvests on high pH soils."

Once again, no actual numbers, so depends on what you mean by high pH.  I
have very productive blueberries in soil with the upper 8" of soil profile
in the mid 6.s, but with about 5.6 below.  Mulched soil, over time, swings
towards neutral if you are starting in normal blueberry range.  Most acid
loving plants only need a percentage of their soil profile to be at a range
where any given nutrients are readily available.  Somehow, highbush
northern blueberries must have ready access to free iron, apparently.

Rabbiteye blueberries have different needs and can thrive in more alkaline
soils, but there is supposedly some range of adaptability even between
various northern highbush cultivars.