4+1 Compost Blend (BULK BUY)

Dr Greenthumbs 4+1 Compost Blend is a premium, biology-rich soil amendment designed for gardeners and growers who need serious volume. Available in 300L or 900L bulk bags, this blend is ideal for revitalising garden beds, building soil for new projects, or supporting high-performance growing systems.

The "4+1" formula is simple and effective. It combines four compost types — cow manure, chicken manure, mushroom compost, and insect frass — with a rock mineral blend containing over 25 essential trace elements. Together, these ingredients create a nutrient-dense, microbe-friendly environment that supports long-term soil health and strong plant growth.

Whether you're managing a large backyard garden, a commercial grow, or a landscaping job, this compost is designed to deliver structure, nutrients, and life to your soil.

Features

• Bulk bags available in 300L or 900L sizes

• Formulated with cow, chicken, and mushroom compost, plus insect frass for biological activity

• Includes a diverse rock dust blend with 25+ trace elements

• Enhances microbial life, water retention, and nutrient cycling

• Ideal for living soil systems, raised beds, and full-scale garden builds

• Designed for Australian growing conditions

• No synthetic additives or fillers

Why You Should Buy

If you're ready to stop buying small bags and start building real soil volume, this blend is your next step. It's not just compost — it's a soil-building system in a single mix. The combination of composted manures, mushroom waste, and chitin-rich insect frass supports beneficial microbes that improve soil fertility, while the mineral dust replenishes depleted trace elements.

This is a serious product for serious growers who want consistent, reliable results at scale.

Freight and Collection

This product is available in bulk bags for pick-up or depot delivery. Customers must have a ute or trailer to collect from the depot.

You can collect your order from our location in Bellambi, NSW, or we can organise delivery to your nearest depot for collection. You must contact us before purchase to confirm freight pricing, which varies by location and carrier availability.

Below are estimated freight rates by region. Final pricing is confirmed upon enquiry.

Estimated Freight Costs:

Sydney – Direct to Driveway
• 300L: $190
• 900L: $220

Melbourne / Geelong – Depot Collection
• 300L: $265
• 900L: $680

Brisbane / Gold Coast – Depot Collection
• 300L: $260
• 900L: $675

Adelaide – Depot Collection
• 300L: $340
• 900L: $890

Canberra – Depot Collection
• 300L: $200
• 900L: $535

Wagga Wagga – Depot Collection
• 300L: $260
• 900L: $675

Bundaberg – Depot Collection
• 300L: $365
• 900L: $1020

Cairns – Depot Collection
• 300L: $625
• 900L: $1600

For locations not listed here, contact us and we’ll arrange a custom quote.

FAQs

Is this compost suitable for growing vegetables?
Yes. This blend is perfect for vegetable gardens, especially where you want to improve soil structure and microbial activity.

How do I apply it?
Use as a top-dress, or mix into your growing medium at 15–25% by volume. Water in after application to activate biological processes.

Can this be used on its own?
It can be used alone in some applications, but for best results, combine it with soil or other organic matter to maintain structure and drainage.

Is this product organic?
While not formally certified, the blend is made from all-natural inputs and contains no synthetic chemicals.

How does delivery work?
Depot delivery requires you to collect your bulk bag with a suitable vehicle. For Sydney, we also offer direct-to-driveway delivery. All freight must be arranged with us prior to purchase.