Iris Cohen wrote:

(zone 5)
i use vinegar in certain acid requiring plants' water (hibiscus, azalea) to
maintain (or get to) a pH 7

vinegar is not recommended, as it will decompose in the soil & may produce
compounds which are toxic to plants. I think you would do better to use
Miracid. City tap water in most locations has enough calcium for most plants.
The usual problem is too much.

Iris,
Central NY, Zone 5a, Sunset Zone 40
"If we see light at the end of the tunnel, It's the light of the oncoming
train."
Robert Lowell (1917-1977)

thanks for the reply...
i tested the soil and the mirAcid (which i *have* been using) is doing nothing
for the pH...
sincerely
Tanya