How do you make compost in bulk?

make compost in bulk
make compost in bulk

How do you make compost in bulk?

Making compost in bulk involves an intensive process of blending, turning, heating, and cooking to break down the raw materials to be utilised as a great resource in your growing environments. There are a few differences and considerations to think about when composting in your backyard to making compost in bulk for commercial growers and viticulturists but the fundamentals are the same.

Ever wonder what process our compost products go through before it reaches you?


It’s a common misconception that compost is just soil with additives to help build organic matter. But the truth is, there is a science behind the process of making quality compost in bulk.


At home, your compost is likely made up of some of the following:

  • Fruit and vegetable scraps
  • Table scraps
  • Garden waste
  • Used tea leaves
  • Flower cuttings
  • Coffee grounds
  • Eggshells
  • Cardboard
  • Small wood scraps


When creating compost in bulk, these sources of waste and scraps look different. The materials we source for our compost are mostly made up of different types of:

  • Animal waste
  • Bark fines
  • Green waste
  • Sawdust


What makes it so difficult to compost kitchen and other waste in bulk?
  1. In production, there is very little control or knowledge of where this type of waste would come from. This can lead to issues around gaining a BioGro certification because it requires guaranteeing an organic product. There are all types of GMOs and chemicals in food that aren’t effective for compost.
  2. Special consent and specific environmental regulations are required for processing kitchen and other waste on a commercial scale. Not to mention the risk of rodents and extreme odour problems.
  3. There is also a risk of the final product being inconsistent if the waste is different in each batch. The materials sourced are kept to natural residues that are easily broken down for the highest quality and most consistent outcomes.


Although compost is made of natural materials, it’s still important to be conscious of the risks involved when handling it.


The composting process in your backyard can also look different from composing in bulk. However, the chemical activity required will look the same. Compost needs the perfect combination of nitrogen, carbon, and oxygen to create the microbe activity necessary to make compost. To get these to work as they should, the materials need to be combined, turned, and heated to a certain temperature to cook the raw materials for the desired outcome.


Each of these steps is essential in creating the compost that growers across South Island use on a daily basis.

1.Recovery & collection

Residues and raw materials are collected from mills and forests around New Zealand.

2. Screening

Separating the decorative grades of bark and fibre and all the raw materials into bark fines media with an in-house grinder.

3. Blending & Windrowing

The blending process includes adding composting additives to bark fines media depending on the compost being created.

4. Composting

The intensive process of aging involves turning the mounds approximately 5-7 times. This allows the mixture to heat to the desired temperatures and cook each time they’re turned.

5. Screening

A final screen is initiated to remove any oversized particles to get the required size specification and prepare for dispatch.

6. Dispatch

Delivery to growers, landscape retailers, and garden centres around the top of the south to happy customers.


We offer a range of composts depending on the needs of the growing environment. This includes:


  1. Greenwaste Compost is a BioGro certified compost for commercial growers to increase nitrogen levels in soils.
  2. HortGro Compost is a BioGro certified compost for farmers and commercial growers for better crop quality by increasing organic matter, carbon contents, and moisture retention in soil.
  3. FishGro Compost is a BioGro certified fish-based compost for large home vegetable gardens and flower beds.
  4. Barnyard Compost, an all-purpose manure-based compost for large scale planting and horticulture projects.
  5. Flourish Compost, a powerful, highly-nutritious mushroom-based compost for large vegetable and flower gardens.

Share this post

Other Topics

Keeping industries informed with research, product development, informed pieces, and market trends.

Post References

You might also like

Book a Delivery

Suggest a Retailer

Know of a suitable retailer that doesn’t stock our product? Let us know and we will get in touch with them. We may need some additional information from you so we’ve requested your email address on the form.

Download the Field Day brochure

Submit a General Enquiry

Our Truck Volumes

3T Truck

Full truck load volumes
  • Bark: 7m³
  • Compost: 4m³
  • Supersoil: 3m³
  • Soil: 3m³
  • Shell: 3m³
  • Stone: 1.5m³

7.5T Truck

Full truck load volumes
  • Bark: 20m³
  • Compost: 10m³
  • Supersoil: 7m³
  • Shell: 8m³

11T Truck

Full truck load + trailer volumes
  • Bark: 25m³ - 65m³
  • Compost: 17m³ - 38m³
  • Supersoil: 12m³ - 29m³
  • Shell: 12m³ - 30m³

In Canterbury or other regions? We offer bulk truck and trailer load volumes throughout the South Island.

Enquire by getting in contact.

Book a free presentation

Horse Arena Surfacing

Request a Soil Health Assessment

Our Retailers

Below is a list of our retailers. Please contact them for stock and supply.

PLEASE NOTE: Not all of our products are supplied to all retailers. We can only guarantee product quality of products we manufacture.

  • Wholesale Landscapes – Stoke Yard (that's us!)
  • Stoke Garden & Landscapes
  • Bay Landscapes & Garden Centre
  • Goldpine Richmond
  • Māpua Landscapes
  • Stonescape Garden Supplies (Concrete & Metals)
North Canterbury
  • Woodend Landscape Supplies
  • Amberley Hire & Landscape Supplies
  • Hanmer Landscape Supplies
  • Garden Box – Middleton
  • Urban Paving & Landscape Supplies – Harewood
  • Pearsons Landscape Supplies – Bromley
  • Styx Mill Landscape & Nursery  – Styx
  • Mitre 10 Mega Ferrymead
  • Odering Garden Centre Christchurch - Philpotts
  • Odering Garden Centre Christchurch - Barrington
  • Mainscape Garden Supplies
South Canterbury
  • Fulton Hogan Timaru
  • Ashburton Contracting Ltd (ACL)
  • Centaland
  • CMT Group
  • Kaikōura Landscape Supplies

Pick-Up Information

We welcome pick-up of product by the public for volumes 1m³ and over. Please check your estimated trailer weight rating below. If your trailer is unable to hold the weight of our minimum pick-up volume, please book a delivery. *We require a minimum order quantity of 3m³ for any bark, compost, soil or shell products and a minimum order quantity of 1.5m3 for any stones or aggregates.

Standard trailer
(750kg limit)
  • Bark / Mulches
  • Shell
  • Compost
  • Soil
  • Stones / Aggregates
Tandem trailer
(1,500kg limit)
  • Bark / Mulches
  • Shell
  • Compost
  • Soil
  • Stones / Aggregates
Tip truck
(2,000kg limit)
  • Bark / Mulches
  • Shell
  • Compost
  • Soil
  • Stones / Aggregates

Product Volume Calculator

*We will quote to the nearest cubic meter.

Recommended depths

Typically you need a finishing layer of screened soil of 100mm when working with an uneven surface. 100mm of soil will allow to even out any hollows and give enough depth to create a flat surface

A general rule for compost is to allow for the depth of the current root structure of your plants with an additional 30-50% to mix in with the base. If you’re planting into holes or filling up a vege garden  you will need to accommodate for this prior to filling up

We recommend 100mm (10cm) deep for new bark gardens and planting into bare areas. For existing gardens with some cover, we recommend 75mm-100mm (7.5cm-10cm)

Note: Barked areas for playground impact protection need to meet NZS5828:2015 standards and is calculated on the fall areas and the height of the playground. Please contact us to discuss your barked playground areas

For paths and driveways which are often exposed to car and foot traffic, we recommend 100mm-125mm (10cm-12.5cm) on newly prepared areas due to settling of product.

This excludes preparation, compaction or drainage gravel underneath. For existing areas 75mm thickness is recommended for areas needing a small top-up.