Wood chips will help retain soil moisture and help protect plants during winter, but they do not enrich the soil or add beneficial bacteria and nitrogen, like natural mulches do. Dyed mulches break down much slower than natural mulches; therefore, require less maintenance.

Dark brown wood chips, also known as chocolate wood chips are environmentally friendly because they are dyed with vegetable based dyes.
Sold by the cubic yard

Red wood chips are environmentally friendly because they are vegetable based dyes.
Sold by the cubic yard