What each load actually costs, and how long it lasts
Bulk bark or wood chip delivered to a driveway runs $80 to $150 a cubic metre, which for the 10 m² bed above works out to $60–$113 per application, and because it breaks down slowly, that one delivery typically lasts 12 to 18 months before the bed needs topping up again. Sugar cane and pea straw are sold differently, by the compressed bale rather than the cubic metre, and at $12 to $22 a bale they look like the budget option: roughly two bales cover the same bed at our calculator's 7.5 cm standard depth, for $24–$44 a load. The catch is how fast they vanish, sugar cane commonly needs redoing every 6 to 8 months, roughly twice as often as bark.
What it actually costs
The same worked example our mulch calculator's own FAQ uses: a 10 m² garden bed at the standard 7.5 cm depth (0.75 m³ per application), priced over 3 years.
| Option | What it includes | Cost |
|---|---|---|
| Bark or wood chip, bulk delivered | One $80–150/m³ bulk delivery, topped up roughly every 12–18 months as it slowly breaks down | $180–$339 over 3 years |
| Sugar cane or pea straw, baled | Around two $12–22 bales per application, redone roughly every 6–8 months as it breaks down fast enough to feed the bed like compost | $144–$264 over 3 years |
| Free council or arborist wood chip | The same slow-breakdown wood chip as the row above, at no cost, but only when a load happens to be going, not on your own schedule | $0 materials, same 12–18 month cycle |
Bark/wood chip and sugar cane bale pricing, and bark's 12–18 month reapplication cycle: The Quote Yard's 2026 NSW mulching cost guide. Sugar cane's faster 6–8 month breakdown: EcoMow's South East Queensland mulching guide, cooler climates can stretch that closer to 12 months. Bale count assumes roughly 6.7 m² of coverage per bale at 7.5 cm depth, scaled from a supplier's 10 m²-at-50mm figure.
Why the cheap bale still wins, even after four extra trips to the yard
Run both out over three years on the table above and the surprising part isn't that sugar cane needs replacing more often, it's that doing so twice as often still doesn't erase its price advantage. Six sugar cane top-ups at $24–$44 each come to $144–$264 over three years, against bark's three deliveries at $60–$113 each for $180–$339. The straw option wins on raw dollars even after six loads to bark's three, because a bale is cheap enough that redoing the whole bed twice as often still costs less than one premium bark delivery. What sugar cane and pea straw actually cost you isn't more money, it's three extra trips to the landscape yard over the same three years.
That's also why it's the standard choice for a vegetable bed and rarely the choice for an ornamental one. Sugar cane and pea straw break down fast because they're straw, not bark, the same speed that means more frequent buying also feeds nitrogen into the soil as it composts in place, exactly the point around edible plants. Bark and wood chip decompose slowly on purpose, trading that soil benefit for a bed you can genuinely leave alone for well over a year. And if a council green-waste giveaway or an arborist's drop-off happens to be running when you need a load, the third row above beats both on price, free, for the same material and the same 12–18 month cycle as buying it.
Common questions
Does bark or sugar cane mulch cost less over a few years?
Sugar cane or pea straw, even after replacing it roughly twice as often. Priced over 3 years on a 10 m² bed, six sugar cane top-ups run $144–$264 total against bark or wood chip's three deliveries at $180–$339, because a bale is cheap enough that the extra reapplications don't close the gap.
How often does sugar cane or pea straw mulch need replacing?
Roughly every 6 to 8 months in warm or subtropical conditions, stretching closer to 12 months in cooler climates, since it's designed to break down into the soil rather than sit on top of it. Bark and wood chip, by contrast, typically last 12 to 18 months before a full top-up is needed.
Why do vegetable gardens use sugar cane or pea straw instead of bark?
Because breaking down fast is the point, not a downside. As sugar cane and pea straw decompose they feed nitrogen and organic matter into the soil, effectively composting in place around the plants, which is exactly what a vegetable bed wants. Bark and wood chip decompose slowly on purpose, which suits an ornamental bed you want to leave alone but does far less for the soil underneath it.
Does a cheap option that needs rebuying often always beat an expensive one you only buy once?
No, it depends on what a top-up actually costs to buy, not just how often you're buying it. Sugar cane wins here because a bale is a small retail unit regardless of quantity, so every reapplication gets bought at the same price as the first one. Our gravel vs concrete vs pavers guide finds the opposite result for the same reasoning shape, gravel's small top-up quantity falls under most bulk suppliers' order minimum, so it gets bought the expensive bagged way instead of at the bulk rate the first delivery got, and that tips the 10-year total the other direction.
Sources
Bulk bark/wood chip and sugar cane bale pricing, and reapplication cycles: The Quote Yard, Mulching Cost NSW 2026. Sugar cane's faster 6–8 month breakdown under warm/subtropical conditions: EcoMow, The Complete Mulching Guide for South East Queensland Gardens. Bale coverage area: Parklea Sand and Soil, Sugar Cane Mulch (10 m² per bale at 50mm, scaled to our calculator's 7.5 cm standard depth). All fetched July 2026.