Are Decomposing Leaves Acidic or Alkaline?

Most leaves are slightly acidic when they fall, with a pH below 6. However, as the leaves break down into leaf mold, the pH goes up into more a neutral range. Leaf mold will not correct pH problems, but will have a moderating effect.

Do decaying leaves make soil acidic?

Decomposition. Highly acidic, fresh-leaf mulch may cause the topsoil to have an increased acidity level but only within the first 2 inches of soil. ... Your decomposed leaves have a reduced acidity level while adding critical nutrients, like nitrogen and humus, to your garden's soil.

Is leaf compost acidic or alkaline?

Reference 2 studied home composts and found a mean pH of 7.0 to 7.5. Yard debris and leaves are the most likely sources of organic material for the home owner, so you can expect your compost to be slightly alkaline.