What is the difference between treated and untreated mulch?

Untreated mulch is significantly less expensive than mulch that has been treated with pre-emergent herbicides. While 1/2 of a cubic yard of untreated mulch may cost around $20, 2 cubic feet of treated mulch may cost around $4.50. Since 2 cubic feet is only about . 07 cubic yards, this is a significant price difference.Click to see full answer. Also to know is, what is the best type of mulch to use? Straw or hay Another great mulch for the vegetable garden is straw, salt hay, or weed-free hay. It looks good and has most of the benefits of the other mulches: retaining soil moisture, keeping down weeds, and adding organic matter to the soil when it breaks down.Additionally, does mulch need to be replaced? Mulch needs to be replaced after a while because it will decompose. If you fail to replace the mulch, it will no longer provide nutrients to the soil. Along with that, as it decomposes it loses its consistency, and eventually, it will not be able to perform many of the other functions that you expect from mulch. Also, what type of mulch lasts the longest? CHOOSING A MULCH Cypress, melaleuca, and pine bark are the longest lasting types of mulch but don’t offer plants many nutrients when they break down. Soil pH may be reduced by pine bark and pine straw, which would be excellent for acid-loving plants like azaleas, but not plants that require high-pH soil.How can you tell if mulch is bad?If your mulch has gone sour, it will smell like rotten eggs or vinegar. The best way to fix this is by spreading it out to dry. Turn the pile frequently and let the sun and air cook out the toxins. Using the mulch without cleaning it up can cause plant problems.

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