A worm bin is a central part of the True Living Organics method. It turns trim, root balls and kitchen waste into castings that carry the biology of a living soil. The book assumes a temperate climate, though, and almost every parameter in it reflects that. This article summarises and adapts the book’s worm-bin method rather than reproducing it. It outlines the bin setup and the kinds of mineral additives the book uses, then rebuilds the temperature, moisture and species choices for a Southeast Asian room where ambient sits at 28–34 °C most of the year.
Source: The Rev, True Living Organics: The Ultimate Guide to Growing All-Natural Marijuana Indoors, 2nd edition (Green Candy Press, 2016). For the full method, read the original.
1. Why a worm bin rather than just buying castings
Bagged castings are widely available and perfectly usable. The argument for running your own bin comes down to three things:
- Freshness. The value of castings in living soil is the living organisms in them: bacteria, fungi, protozoa and beneficial nematodes. Bagged product that has sat dry on a shelf in a hot warehouse has likely lost much of that. The book’s position is blunt: use fresh, living castings or compost, ideally with live worms still in it.
- Closing the loop. Trim, stems, root balls and kitchen waste all become inputs instead of waste. This is what makes multi-cycle soil recycling cheap.
- Control of mineral content. The book feeds minerals to the worms, not only to the soil. Its reasoning is that intense biological activity breaks down hard-to-access minerals far faster than they would weather in soil. Whether or not the mechanism works exactly as described, the practical result is that you control what goes into your castings.
The book itself is honest about this: a worm bin is optional. What the method does require is access to genuinely fresh castings or compost from somewhere.
2. The bin, and what to feed
The book uses a standard stacking-tray home worm bin with a drain tap at the bottom. Worms live in the top tray, and finished castings are harvested from below.
Typical feed in the book: juice pulp, banana peels, spoiled vegetables, coffee grounds and tea (paper filters included), shredded office paper, and plant material, including cannabis stems and leaves left after harvest. If you grow under a Thai licence, check your permit’s conditions on recording and disposing of plant residues before putting cannabis stems or leaves into the bin.
Preparation: let fresh plant material dry out somewhat before feeding, and chop stems. The Rev notes that he does not always do this. When his bin runs dry, he feeds fresh, wet plant material on purpose to raise the moisture.
Mineral and buffering additives for the worm tray (summarised from the book):
| Additive | Role, as described in the book |
|---|---|
| Crushed or fine oyster shell | Calcium source; the book’s preferred pH buffer |
| Crushed eggshell | Slow pH buffer and a free kitchen by-product |
| Rinsed coco coir | Buffers pH and holds moisture; the book reports heavier worm breeding with it and potassium release as it decays |
| Greensand | Reportedly supplies iron and trace minerals |
| Azomite | Reportedly a broad-spectrum trace-mineral source |
| Small-grade perlite | Aeration; per the book, more air supports a larger microbial population in the castings |
| Humate (humic acid ore) | Per the book, improves uptake of secondary and trace nutrients from the castings (not verified here) |
| Kelp meal | Reportedly potassium, trace elements, enzymes and plant growth hormones (the hormone claim is not verified here) |
| Alfalfa meal | Nitrogen and iron; the book also credits it with triacontanol (see caveat below) |
| Rock phosphate, small amounts | Phosphorus |
Two of the book’s claims should be treated as unverified. The first is that triacontanol is found only in alfalfa. In fact it is a common plant-wax constituent, found in many species and in beeswax. The second is the specific mechanism the author proposes for why his worm leachate has such a high TDS. The additives themselves are conventional vermicomposting practice. The explanations attached to them are the author’s own.
3. Species: the single biggest tropical adjustment
The book assumes Eisenia fetida, the red wiggler, because it is the standard temperate composting worm. In Bangkok, Chiang Mai, Ho Chi Minh City or Hanoi it is a marginal choice, so get the species right before you buy stock.
Published temperature data for the three main vermicomposting species:
| Species | Common name | Temperature behaviour |
|---|---|---|
| Eisenia fetida | Red wiggler / tiger worm | The widest temperature tolerance of the three. Commonly cited working figures: optimum about 20–25 °C, stress above about 30 °C, lethal around 35 °C. Cocoon output rose with temperature from 10 to 25 °C and peaked at 25 °C. It tolerates tropical ambient but does not thrive in it |
| Eudrilus eugeniae | African nightcrawler | Narrow tolerance. In a laboratory study, no worms survived below 12 °C and all died within 50 days at constant temperatures of 30 °C and above. Growth was highest at 29 °C, and cocoon production was best at 22–25 °C |
| Perionyx excavatus | Blue worm / Indian blue | A tropical species. In a comparative study it was, like E. eugeniae, less temperature-tolerant than E. fetida. In southern Africa, cold rather than summer heat limited its outdoor use |
Sources for the table: Reinecke, A.J., Viljoen, S.A. & Saayman, R.J. (1992), Soil Biology and Biochemistry 24(12): 1295–1307; Viljoen, S.A. & Reinecke, A.J. (1992), “The temperature requirements of the epigeic earthworm species Eudrilus eugeniae (Oligochaeta): a laboratory study”, Soil Biology and Biochemistry 24(12): 1345–1350; Reinecke & Kriel (1981) on temperature and E. fetida reproduction.
The practical reading: E. fetida will survive a Southeast Asian bin, but in a 28–34 °C room it sits close to its stress limit. E. eugeniae and P. excavatus are tropical species. Even so, they are not heat-proof. The constant-temperature data suggest E. eugeniae does best with the bedding in the mid-20s and kept below 30 °C. Its cold sensitivity also matters in the cool season in northern Vietnam and northern Thailand. A cheap thermometer pushed into the bedding tells you more than the room temperature does.
On local availability: in Vietnam the commonly sold worm is P. excavatus (trùn quế). In Thailand it is usually E. eugeniae (sold as AF) or the local Pheretima peguana (ขี้ตาแร่). Check the species with the seller.
E. eugeniae is also commonly described as sensitive to temperature fluctuation. A bin in an air-conditioned room that swings from 22 °C at night to 32 °C in the afternoon is likely harder on it than a shaded spot that stays steadily in the high 20s. Stability and staying below 30 °C both matter.
pH: the general working range for vermicomposting is reported as roughly 5–9, with near-neutral considered ideal. This is why the shell and coir buffering in the additive list matters.
4. Moisture in a hot, humid room — the opposite problem
Temperate worm-bin advice is dominated by “do not let it get too wet.” In a tropical setting two pressures pull against each other:
- Higher ambient temperature raises worm metabolism, so feeding rate, moisture loss and oxygen demand all rise. The book says this directly: at high temperature, watch feeding, moisture and airflow closely.
- High ambient humidity slows evaporation from the bin surface, while the interior can still go anaerobic from wet feed.
The book’s correction levers transfer cleanly:
- Too wet → add shredded paper and dry coco coir.
- Too dry → water with dechlorinated water, or feed wet kitchen scraps.
- Target: consistently slightly moist, never saturated, never dry.
Three tropical-specific additions:
- Never let direct sun hit the bin. The book treats this as absolute, and in this region it matters even more. A plastic bin in Southeast Asian afternoon sun can quickly heat past the lethal range for any composting worm. Keep it in deep shade or indoors.
- Leave the drain tap open with a catch tray beneath it. The book does this for airflow. Here it also stops leachate pooling and going anaerobic in the heat.
- Feed smaller amounts more often. A large feed load in a 30 °C bin heats and sours faster than the same load at 18 °C. If the bin smells sour rather than earthy, you have overfed.
5. Worm leachate versus worm tea — do not confuse them
This is the most common and most damaging mix-up in living-soil practice, and the book is explicit about it.
Worm leachate is the liquid that drains out of the bottom of the bin. It is not brewed, it is not aerated, and it is not compost tea. Its TDS can be very high. The author describes his own leachate as concentrated enough that he treats it as a hazard rather than a fertiliser. He freezes it in small cubes for later use and does not dilute it before freezing.
Rules for using leachate:
- Dilute heavily before it touches a plant.
- Do not use it at every watering. Mineral salts build up in the root zone, and you will need to flush the pot.
- Surplus leachate is best poured back onto the top tray of the worm bin at feeding time, or heavily diluted onto ornamental plants.
The high salt concentration is a direct consequence of feeding minerals to the worms. If you use the additives in section 2, expect a leachate reading that would be alarming in an irrigation solution.
Worm tea, by contrast, is a brewed extract. It is a separate topic with its own food-safety caveat about brewing with added sugars.
6. A tropical setup checklist
- Species: buy locally and confirm the species with the seller. E. eugeniae or P. excavatus is a better fit than imported Eisenia fetida, as long as you keep the bedding below 30 °C.
- Location: shaded and at a stable temperature. Choose a spot that gets no direct sun at any time of year; remember that the sun passes north of overhead in mid-year at these latitudes. A store room or the space under a bench beats an air-conditioned room that cycles on and off.
- Bedding: rinsed coco coir plus shredded paper. Coir is cheap and produced locally across the region, so here Southeast Asia has an advantage over the book’s author.
- Buffer: crushed oyster shell and eggshell from the start, not as a rescue measure.
- Aeration: small-grade perlite mixed into the feed; tap left open.
- Water: dechlorinated. Check with your local water utility whether it uses chlorine or chloramine. Free chlorine dissipates if the water is left to stand. Chloramine does not off-gas this way. Carbon filtration removes it; standing does not.
- Feeding: little and often, with dry plant material chopped small. A sour smell is your overfeeding alarm.
- Harvest and use: harvest from the lower trays once the material is dark and crumbly, smells earthy, and has no recognisable food left. The book mixes castings into soil at roughly 3 parts soil to 1 part castings. It does this shortly before use (about a day before transplanting) rather than storing pre-mixed soil, because castings dry out in storage and their value lies in the living biology.
7. What this does not solve
Two honest limits.
A home worm bin producing a few litres of castings a month will not supply a commercial-scale operation. For anything beyond a personal grow, the realistic model is a small bin for quality control plus a bulk supplier whose product you can inspect fresh.
And vermicomposting is not a pathogen-reduction process. It runs at ambient temperature, well below the 55 °C thresholds that regulatory standards use for pathogen destruction in composting. Do not feed manure, meat or dairy into a worm bin and then treat the output as sanitised. Plant material and vegetable kitchen scraps are the safe inputs, and they are what the book feeds anyway. Anything involving manure or guano belongs in a properly managed hot-composting process.
Which species are you running, and at what bedding temperature? We would particularly like to hear from growers who have compared Eudrilus eugeniae or Perionyx excavatus against Eisenia fetida in the same room. The published temperature data suggest a large difference in this climate, but we have not seen a side-by-side test with cannabis trim as the feedstock.
This article is technical horticultural information for readers operating legally in their jurisdiction. Cannabis cultivation is regulated differently in every country. In Thailand, cannabis flower is a controlled herb under the Notification of the Ministry of Public Health Re: Controlled Herbs (Cannabis) B.E. 2568, and cultivation requires the applicable permit or licence. Check your local law before growing. Nothing here is legal advice.