Mulches fade and breakdown, but fading seems to be the leading reason for homeowners to re-mulch their beds.
Single shredded mulch
Typically a mixture of tree bark and wood that is run through a tub grinder one time.
Double shredded mulch
Typically a mix of tree bark and wood that is run through a tub grinder twice.
Triple shredded mulch
Typically a mix of tree bark and wood that is run through a tub grinder three times.
The more times a wood mulch is ground, the finer and more uniform the texture becomes. The finer ground mulches break down faster, not lasting as long as coarser ground mulches.
Dyed mulches are more expensive but hold their color longer than natural mulches. Some consumers are concerned about the source of the "waste wood" (shredded pallets?) used in some dyed mulches on the market.
Remember, the dye can stain things and the color can wash-off (especially the chunkier mulches), so try to work with dyed mulches in periods of dry weather.
Dyed brown mulch
Shredded bark/wood mulch that has been dyed brown. This is Bob’s favorite color since it looks the most natural in landscape beds.
Dyed black mulch
Shredded bark/wood mulch that has been dyed black. Contrasts with flowers and other plant colors the most.
Dyed red mulch
Shredded bark/wood mulch that has been dyed red. Makes a bold landscape statement all by itself.
Landscaping products purchased in bulk are typically sold by volume or weight. Mulch products are sold by the cubic foot or cubic yard, so how much is in one cubic yard?
Coverage can vary greatly due to the type of mulch used. As a general guide, below are the amounts of dry, double-shredded hardwood mulch that were required on projects, where 1 cubic yard covers 150 square feet at Bob's recommended depth of 1-1/2 inches.
Depth inches : Yards per 100 sq ft
Nuggets last longer than shredded hardwood mulches and are available in different sized nuggets. Brown color with a pleasant pine odor.
Pine needle mulch is typically seen more often in southern United States landscapes. Can be a fire hazard with lit cigarette butts.
Cypress mulches have a distinctive orange color and fresh odor. Resist decay better than hardwood mulches.
Mushroom manure (or mushroom compost) is typically used for mulching flower beds, topdressing seeded lawns or mixing with soil to add organic matter. Only available in certain regions.
Special grinds and blends of hardwood mulch are considered playground mulches and used around playground equipment to soften falls.