Plant saps & extracts do have various pH values, due to storage of
different amounts and species of organic acids inside the vacuole. All
plant cells have a pH between 6.8 and 7.3 inside of the cytoplasm.
Lemons have a pH of 2.0, cucumber of pH 7.0. The stems of cucumber
and pumpkins may even show a pH that is clearly alkaline or above 7