ACID MEDIUM -- A compost which contains little or no lime and has a pH of less than 6.5. Sometimes referred to as "sour" soil by gardeners.
AERATION -- The loosening of soil by digging or other mechanical means to allow air to pass freely.
covered recently many of the winter things to talk about, like pruning, spraying Lime Sulphur etc now might be a good time to look at some of the terms commonly used and what they mean. It may pay to cut out this for future reference.
ACID MEDIUM -- ...
  
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