The source of most dyed mulch is recycled wood.
So far, so good.
If they were used in the transportation of chemicals, they may be contaminated.
The Spruce / Jacob Fox
Enter the MSC Certification Logo, which certifies that a mulch or soil product is free of CCA-treated wood.
MSC stands for Mulch and Soil Council.
It is recommended policy, therefore, to wear garden gloves whenever you will be touching this product.
The Spruce / Jacob Fox
But what about our dogs and cats?
Erecting a fence is one option for implementing this precautionary measure.
Whether or not colored mulch affects plant growth is a separate question.
Gardener cutting a chicken wireHarald Walker / Getty Images
Colored Bark Mulch.University of Massachusetts Extension
