Stop! What’s in That Mulch?

Many home gardeners opt to buy in mulch when the weather begins to warm. In an effort to protect their garden beds from water evaporation and help combat weed growth they instinctively purchase large mulch loads and then spend the weekend dispersing it.

But, have you ever considered what goes into making that load of mulch?

Presumably it’s bark and leaf matter that’s been recycled as a byproduct of the timber millers. And, in many cases this is what you’re getting. However, if you expect it to be 100% of the overall product you’re either living in denial or ignorance is bliss.

Many mulch wholesalers and manufacturers will substitute a variety of items to bulk up their volumes. Wood pallets and crates – usually made from foreign timbers are a great alternative to sourcing natural timber fibres. And, while we would like to believe that it is just the waste products that are being used, many times the whole tree including the inner core is ground.

While this is still all natural it means that you’re the one getting the raw end of the stick. The inner trunk of the tree will decompose far quicker that the bark which means you will have to mulch your garden more often. Suppliers who mulch the whole tree and imported softwoods benefit from cheaper overhead costs and also from increased customer orders but usually charge similar prices to quality providers.

And, what about those articles that warn us of bringing ants and termites onto our properties. Is there any cause for concern? The simple answer is no.

How can you tell what’s in the mulch?

Before you allow the mulch to be offloaded onto your driveway, check the contents. Here are some things you should be able to look for and discuss with the supplier;

    • Check for green or light-coloured wood – bark mulch should be fairly dry to moist if it is old enough and should have a dusty feel about it. Softwood that has been sitting in a mulch pile for some time will look greenish and have a slimy texture.
    • Ask the supplier where they source their mulch from – many tree removal companies run a mulching arm as part of the business operations. While this is not a bad thing and the mulch produced will have no ill-effects on your gardens, it is an inferior product compared to milled bark and should be much cheaper.
    • Ask how long it is stored for – the longer the mulch is stored the more decomposing has already taken place. If the mulch has been sitting in their yard for some time then it may rot down too quick in your garden beds, and thereby force you to buy more later in the season.

The best mulch you can get is from recycling your own plants and materials, and it’s cheaper too. But if you must buy from a mulch supplier, take the time to find out what you’re getting and don’t just settle for what you’ve been given. is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Additionally, we participates in various other affiliate programs, and we sometimes get a commission through purchases made through our links.