I've noticed instant results and improvements in all areas of my garden since adopting the HPO methodology
The girls LOVE this product and great at all stages.
GRO-DIRT Full Spectrum – Organic Living Soil
GRO-DIRT Full Spectrum is our flagship high-performance organic living soil engineered for professional cultivation. Developed through over a decade of field testing, it combines aerated peat and coir with humic-rich compost, IMO-enriched biodynamic inputs, natural minerals, and a complete microbial consortium of mycorrhizae, Trichoderma, and soil probiotics. Designed to deliver optimal nutrition, resilience, and yield from cutting to harvest with just water, GRO-DIRT Full Spectrum provides a stable, biologically active rhizosphere that supports vigorous growth, high BRIX expression, and consistent results across indoor, greenhouse, and outdoor systems.
GRO-DIRT Full Spectrum – Organic Living Soil
Sale price$55.00 AUD
Where biology, minerals, and science collide.
Explore the Edge of Organic Innovation & Cultivation
GRO-DIRT
FULL SPECTRUM
GRO-DIRT Full Spectrum is our flagship 100% organic living soil — engineered for maximum full-cycle performance evenon water alone. Designed for serious growers, it combines in-house microbial & botanical ferments, live mycorrhizal inoculants, custom high-humic compost, premium-grade worm castings, and a precision-balanced structure that outpaces traditional “super soils” in yield, flavour, and root development.
Organic Doesn’t Mean Underpowered
We reject the outdated notion that organic cultivation is slow, weak, or imprecise. Our living soils are not just rich in nutrients — they’re engineered ecosystems, biologically primed to deliver consistent, high-performance results across any growing style. While conventional soils often rely on synthetic inputs or sterile blends, GRO-DIRT leverages advanced composting, high-density microbial consortia, and carefully balanced mineral ratios to drive nutrient cycling, hormonal signaling, and root-zone synergy. This means faster establishment, denser growth, and higher-quality yields — all without the burn or crash cycles seen with chemical programs.
Is Full Spectrum the GRO-DIRT for you?
If you’re looking for a true plug-and-play living soil with serious performance, this is your go-to. GRO-DIRT Full Spectrum is precision-built to carry plants from clone to harvest with just water, no bottled nutrients required. Loaded with our highest concentration of beneficial microbes (over 18 million CFU/g), this blend drives root-microbe symbiosis from day one.
Engineered for elite indoor and greenhouse cultivation, it delivers balanced nutrition, rich oxygenation, and powerful microbial cycling — ideal for photoperiods or heavy-feeding autoflowers. It’s a true high-performance biological engine, strengthened by long-aged composts, custom microbial extracts, fermented inputs, and our ultra-porous aeration matrix.
Best for: High-output indoor/greenhouse growers, water-only runs, terpene-rich flower, optimal microbial synergy.
The Science Behind GRO-DIRT
At the core of GRO-DIRT’s performance is not just what goes into it — but how it’s made. This isn’t your average soil mix. Every step, from fermentation to microbial inoculation to structural engineering, is guided by rigorous process control, scientific precision, and biological insight. Below, we unpack the key technologies and methods that make GRO-DIRT a category-defining living soil — purpose-built for serious growers who demand more from their media.
GRO-DIRT is fortified with over 15 unique fermented inputs — including horsetail (Equisetum), dandelion, comfrey, alfalfa, Kelp, hops, and ocean minerals (Sea-90). These aren’t raw plant powders or basic KNF — they’re processed in controlled microbial fermentations, in specialised temperature-controlled custom reactors using our own EM1 cultures. The result: living metabolites, enzymes, trace minerals, and plant signalers that boost growth and resilience from the root zone up.
We've significantly upgraded the way we do our IMO collections. We selectively cultured high-performing IMO lineages and scaled them under controlled conditions — locking in the best traits. Each GRO-DIRT batch is now inoculated with this custom IMO derivative, along with live in-house-grown mycorrhizal fungi and freshly fermented EM1, aerobic microbe teas along with a suite of other beneficial micoorganisms and rhizobacteria — ensuring a thriving, competitive microbiome from day one.
The trouble with trying to make a really nutritionally dense soil that can perform well on Water-Only is that all the ingredients that hold a lot of horsepower - also hold a lot of moisture (Compost, Castings, Amendments, minerals), this presents a challenge as a nutritionally dense, yet very low O2 blend means slow growth. GRO-DIRT Full Spectrum Blend uses a very carefully put together drainage profile containing multiple, Long lasting raw-ores (Like Scoria and Pumice), along with multiple Perlite grades and 3–6mm granulated cork bark — a sustainable, ultra-light, porous material that maintains ideal aeration, insulation, and microbial colonization without waterlogging or compaction. This allows us to maintain high nutrient density without compromising structure.
A premium blend of pecan shell and macadamia nut shell biochar, inoculated with fresh microbes and special protein sources, pre-activated for each batch. Presents a great contrast to most “sticks and twigs” biochar on the market, made from “tree trimmings” and unknown phytotoxicity levels. Nut shell char is sustainable, non-phytotoxic, premium, and of a consistent sizing. Pecan, we find, crumbles up and evenly distributes through the mix, with the macadamia nut acting as semi “microbe orbs” that trap ingredients and moisture, and provide a place for beneficial organisms to live and grow outward from—lasting longer term.
Each GRO-DIRT batch is made indoors using clean, custom equipment, made only to make GRO-DIRT — no tractors, bobcats and rough treatment. Amendments are hand-measured to the gram per batch (not in bulk), and each stage of the mix is portioned to within exceedingly slim margins. Multi-stage composting and curing is carried out in sealed batch bags for 6+weeks, indoors before bagging. The result: an ultra-consistent, ready to use, peak-performance soil — every time.
No Mixing. No Measuring. Just Growing.
How to Use GRO-DIRT
Simply open the bag, lightly fluff, and plant directly. GRO-DIRT is water-only from cut to harvest in most scenarios, as long as a large enough container is used. For maximum performance—and when using smaller container sizes—it can be boosted with our CROP-DRESSINGS: HERB-SUPERB & STONE-AGE, our POWR-BOOSTER soluble fertilisers: AQUA-MARINE, OCEAN-POTION, and GREEN-SUPREME, as well as our GRO-BIOTICS: RHIZO-MOJO, ANTI-MATTER, and DARK-MATTER.
Dial in your grow with our Dynamic Feed Chart & Soil Volume Calculator
Need to reammend your GRO-DIRT? Watch our video guide HERE.
Frequently Asked Questions
What is GRO-DIRT Full Spectrum and how is it used?
GRO-DIRT Full Spectrum is a complete organic living soil designed for use from cutting to harvest with just water. It delivers full nutrition, rich biology, and professional-grade results effortlessly.
What makes GRO-DIRT Full Spectrum different from other soils?
GRO-DIRT Full Spectrum combines humic-rich compost, biodynamic IMO inputs, full-spectrum microbes, and premium minerals in a high-porosity base mix—creating a biologically active, self-sustaining ecosystem for explosive growth.
Do I need to add nutrients or boosters with GRO-DIRT Full Spectrum?
Nope. GRO-DIRT Full Spectrum is fully pre-charged. Just add clean water and let the living soil feed your plants naturally, with no bottled nutrients or topdressings required for success.
Is GRO-DIRT Full Spectrum suitable for indoor, greenhouse, or outdoor use?
Yes. GRO-DIRT Full Spectrum performs across all environments—indoors, outdoors, or greenhouse—providing consistent results, resilience, and top-tier quality in any grow style or condition.
How long does GRO-DIRT Full Spectrum last? Can it be reused?
Absolutely. GRO-DIRT Full Spectrum is designed for multiple runs. With proper care and re-amending, it can be reused season after season, improving over time like a fine wine.
What microbes are included in GRO-DIRT Full Spectrum?
It includes Endo/Ecto Mycorrhizae, Trichoderma, and soil probiotics. These microbes solubilize nutrients, protect roots, and drive vigorous growth by building a living, self-balancing rhizosphere.