Fix pH Value ongoing with right plant
A pH of 6.2 is pretty acidic for soil . A more obvious method to lower acid would be limestone as gravel. And for a fast start ,add lime powder, available at any agriculture supply. Rototilling would be good ,but just sprinkling on the surface would be some help.  You can measure soil pH yourself easily. Put a soil sample in distilled water and shake in a sealed container ( to avoid CO 2 from the atmosphere ) .Then get pH indicator solution from a pet shop ( bromthymol blue ?) and test the water after the soil settles. Aquarium water is routinely tested with this indicator.