Mulch Types Compared
The main mulch types are shredded hardwood, bark, pine straw, rubber, and stone. Shredded hardwood is the cheapest all-rounder, bark lasts longer, pine straw suits acid-loving plants, and rubber and stone never break down but also never feed the soil. For most flower beds, shredded hardwood or bark is the practical choice.
Organic vs inorganic
Organic mulches (hardwood, bark, pine straw, leaves) break down over a season or two, improving the soil as they go - which is why they need topping up. Inorganic mulches (rubber, stone) last for years but add nothing to the soil and can hold heat.
Wood and bark are the standard for beds. Stone suits permanent borders and drainage areas. Rubber is sometimes used under play equipment.
Which to choose
For general beds, shredded hardwood gives good coverage at the lowest cost. For a longer-lasting, more decorative look, bark nuggets hold up better. For acid-loving plants like azaleas, pine straw or pine bark is a good match.
Whatever you pick, aim for 2 to 3 inches and keep it off stems and trunks. Use the mulch calculator for the amount.
FAQ
What is the longest lasting mulch?
Stone and rubber last the longest because they do not decompose. Among organic mulches, bark nuggets last longer than shredded wood or pine straw.
What mulch is best for flower beds?
Shredded hardwood or bark for most beds; pine straw or pine bark for acid-loving plants. They look good, suppress weeds, and improve the soil as they break down.
Is rubber mulch safe?
It is widely used, especially under play equipment, but it does not feed the soil, can hold heat, and is harder to remove later. Many gardeners prefer organic mulch for beds.