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Mulch Types

Organic or inorganic

The first decision is whether you want mulch that rots. Organic mulch decomposes, adding organic matter to soil and supporting soil life, but it has to be replenished. Inorganic mulch stays put for years, but contributes nothing to the soil and can make future planting awkward. Planted beds usually benefit from organic material; hardscape borders and dry areas often suit stone.

Shredded hardwood and bark

Shredded hardwood mulch knits together, resists washing off slopes and gives a tidy look. Bark mulch, from the outer bark of trees, comes as shredded bark or as nuggets in several sizes. Nuggets look neat but can float away in heavy rain and roll down slopes. Both are widely available in bags and bulk.

Wood chips

Arborist wood chips, a mix of wood, bark and leaves from tree work, are coarse, varied and often inexpensive or free locally. They make good path and tree-ring mulch and break down at a moderate pace. Appearance is less uniform than bagged products.

Dyed mulch

Coloured mulch is usually wood that has been dyed. Colour fades over a season or two. Ask what wood source is used; reputable producers can tell you.

Compost and leaf mould

Compost and shredded leaves are excellent soil builders. They break down quickly, so they need replacing more often, and they can be a seedbed for weeds if laid thinly. Many gardeners lay compost first, then a coarser mulch on top.

Straw and pine needles

Straw is common in vegetable gardens and around strawberries; use straw rather than hay, which tends to contain seeds. Pine needles form a light, airy mat that stays in place on slopes and are often used around acid-loving plants, though their effect on soil acidity is generally small.

Stone and gravel mulch

Stone is permanent, does not blow away and suits xeriscapes and drainage areas. It absorbs and radiates heat, which can stress some plants. Calculate with the gravel calculator or river rock calculator.

Rubber mulch

Rubber mulch is made from recycled tyres. It lasts many years and is used in some play areas, but it does not feed soil and its use in planted beds is debated. See the rubber mulch guide.

Comparison

Choosing for your yard

Think about what grows there, how much upkeep you want, slope, nearby buildings, and budget. For beds next to a house in fire-prone areas, check local guidance about combustible materials. For vegetable gardens, use materials you are comfortable having near food. For the quantity, the mulch calculator works for every organic type.

Sourcing and sustainability

Ask where mulch comes from. Some products are by-products of sawmills or tree care; others are made from recycled pallets or construction wood, which may contain treated or painted pieces. Reputable producers explain sources. Local municipal programmes sometimes offer compost or chips made from yard waste, which keeps material local.

Colour and appearance

Natural mulch weathers to a grey-brown over a season. Dyed products keep colour longer but also fade. If appearance matters, a light top-up each year keeps the colour fresh without building excessive depth.

Smell and pests

Fresh mulch can smell strongly for a few days. Mulch is a habitat for many harmless insects; keep organic mulch a little back from house walls as a general precaution. Cedar and cypress are often marketed for pest resistance; evidence varies.

Metric volumes by type

For metric gardeners, volumes and approximate weight using 0.35 US tons per yard for a moist organic mulch:

Mixing types

Many gardens use more than one: compost in vegetable beds, shredded hardwood in borders, chips on paths and stone near downspouts. Choosing by location rather than one product for the whole yard usually gives the best result.

Mulch near the house

Keep organic mulch a few inches below siding and away from wood trim so moisture and insects are not encouraged against the structure. Make sure the soil and mulch slope away from the foundation. In regions with wildfire risk, local fire services often advise a non-combustible zone right next to buildings, using gravel or stone instead of bark. That is one place where choosing an inorganic material is about safety rather than looks, and it is worth checking your local guidance before mulching.

Whatever type you pick, apply it to moist soil after weeding. Mulch locks in the conditions underneath, so spreading it over dry soil or established weeds keeps those problems in place rather than solving them.

Trying a small test area for one season is a low-risk way to see how a new material looks and performs in your own yard.

Worked example

Illustrative examples (2026-10-29), not quotes or guarantees.

200 ft² of perennial beds: shredded hardwood at 3 in ≈ 1.85 yd³; compost at 1 in under 2 in bark ≈ 0.62 yd³ + 1.23 yd³. Both total similar volume; the layered option feeds the soil more.

FAQ

Which mulch lasts longest?

Inorganic types like stone and rubber; among organics, larger bark nuggets.

Does dyed mulch hurt plants?

Depends on the wood and dye; ask the producer about sources.

Is free wood chip mulch good?

Often very good for paths and trees; let fresh chips age near tender plants.

Related: Mulch cost · Mulch depth · Bags vs bulk