Close

Login

Please login with your username and password.

Login

Can’t remember your accounts password?

Can't access your account?

Please select your language

This page is available in the following languages:

    Please select your country

    ​Preventing Sour Mulch

    Sour mulch may result when stockpiled mulch becomes compacted — usually due to high piling. This prevents oxygen from reaching the inner regions of the pile, resulting in anaerobic fermentation of the wood — a process that produces organic acids.


    Here's how to avoid this potentially plant-damaging mulch condition:

    • Colorbiotics recommends limiting the height of processed mulch piles to 10 feet or less; ideally configured in compost windrows less than 5 feet tall so mulch can be turned frequently to promote aerobic decomposition.
    • Correct the acidic condition by spreading the processed wood fiber in a shallow layer and watering heavily to leach away potentially toxic chemicals.
    • Add large amounts of limestone to also help neutralize acidity.
    sour-mulch.jpg

    ​​