This might sound strange or Crazy but tree leaves contain huge amounts of acid. Plants such as azalea, parsley and blueberries would love to have a cup of leaf tea.
How to make leaf tea....
you will need:
a 5 gallon bucket
a small bag of brown oak leaves
Fill the bucket 1/2 full of the oak leaves
then fill the bucket to just cover the leaves
set the bucket in the sun for 1 week....the tea will be dark brown when done.
Strain the mixture and use on your plants.