Lemon halves and other vegan kitchen waste make great additions to a compost pile. But, more often than not, kitchen waste on its own is not enough to build an efficient compost pile. Moist food waste like lemon halves must be balanced with an equal amount of drier material like grass clippings, dried leaves or other garden waste. Otherwise the compost pile will be too moist and mushy to break down its contents. Only when moist and dry materials are present and the pile is about as moist as a wrung-out sponge can the bacteria compost effectively.
Use a sharp knife to dice the lemon halves into small pieces. The smaller the pieces in your compost pile, the more quickly they will break down.
Spread the lemon pieces over the top of your compost pile.
Use a stick to turn the compost pile. Mix the ingredients so that the material that was on the bottom is now on the top.
Turn the pile once weekly or every time you add new material to the pile. The lemon halves will turn into humus in roughly six months.