# Living soil (no-till, water-only organic growing)

> Living soil is a large, biologically active, amended organic soil that is reused without tilling and watered with plain dechlorinated water; soil organisms release nutrients. It is forgiving and low-input once established but slow to correct, so build it well, keep it moist and mulched, never use salt-based nutrients or sanitisers on it, and don't chase pH. Most of its claims are grower practice rather than tested in cannabis.

- Canonical: https://genetixbay.com/knowledge/systems/living-soil.html
- Category: Systems · Level: Intermediate
- Evidence: Grower practice · Status: Draft: awaiting expert review (some figures are being checked)
- Stage: Any stage · Systems: Living soil
- Updated: 2026-10-31 · Licence: CC BY-SA 4.0 (https://creativecommons.org/licenses/by-sa/4.0/), attribute "GenetixBay Knowledge Base (genetixbay.com/knowledge)"

## Questions and answers

**What is living soil and how is it different from regular soil?** Living soil is a large volume of compost-rich, amended organic soil that is reused without tilling and watered with plain dechlorinated water, while soil microbes and invertebrates release nutrients from organic matter. Regular indoor soil is a bagged potting mix fed with dilute bottled nutrients and usually replaced each run. Living soil relies on biology, mulch and top-dressing rather than salt-based feeds.

**Do I need to [pH](https://genetixbay.com/knowledge/glossary/ph.md) water for living soil?** You generally do not need to pH-adjust water for living soil. Organic matter and carbonates buffer the root zone, and plants and microbes work around a near-neutral pH of roughly 6.3–7.0. Use dechlorinated water as it is unless it is very alkaline. Adjusting water to pH 6.0 out of habit is a common mistake rather than accepted living-soil practice.

**How big a container for living soil?** Living soil needs a container of at least 50–100 litres (15–25 US gallons) per plant, or a raised bed, according to grower practice. Small pots lack the biological and nutrient buffering that makes living soil forgiving, and small pots of 'living soil' fed like hydro are a common mistake. Keep the volume evenly moist and covered with 3–5 cm of mulch.

**Can I use bottled nutrients in living soil?** Salt-based bottled mineral nutrients should not be used in living soil, because they bypass and can disrupt the soil biology that the system depends on. Feed the soil instead: top-dress [organic amendments](https://genetixbay.com/knowledge/glossary/organic-fertiliser.md) such as compost, worm castings, seed meals, kelp or bone and fish meal, and water them in. Fast-acting organic inputs like fish hydrolysate or kelp extract can bridge short gaps.

**How do I fix a [deficiency](https://genetixbay.com/knowledge/glossary/nutrient-deficiency.md) in living soil?** Fix a living-soil deficiency by diagnosing before amending, because pH or watering problems and cold soil cause most apparent deficiencies; biology slows below about 15 °C. If a nutrient really is short, top-dress the right amendment and water it in, then bridge the days to weeks it takes to release with a fast-acting organic input such as fish hydrolysate, kelp extract or a light foliar spray.

**Short answer.** Living soil is a **large volume of compost-rich, amended soil** that you **reuse without tilling** and water with **plain, dechlorinated water**. Soil microbes and invertebrates mineralise organic matter into plant-available nutrients. Done well, it needs little more than water, mulch and a top-dress between runs. Don't pH-adjust aggressively, don't add salt fertilisers, and don't sanitise it. The evidence base is mostly *Grower practice*: soil-health principles from agronomy are well established [1], but controlled cannabis comparisons of living soil vs other systems are scarce.

## How it works

- **Nutrients** come from organic amendments (compost, worm castings, seed meals, rock dusts, kelp, bone/fish meal) released by biology. Release speed depends on moisture, temperature and organism activity, so it lags by days to weeks.
- **pH** is buffered by organic matter and carbonates; plants and microbes work around a near-neutral pH. Jardin leaves living-soil pH uncontrolled at ~6.3–7.0 [4].
- **No-till** keeps fungal networks and soil structure intact between runs; a mulch layer and optionally a cover crop keep the surface moist and alive (directly echoing NRCS principles: minimise disturbance, keep soil covered, keep living roots, maximise diversity [1]).

## Numbers that matter

| Parameter | Target | Notes |
|---|---|---|
| Container volume | ≥ 50–100 L (15–25 US gal) per plant, or beds | Small pots lack buffering; *Grower practice* |
| Water | Dechlorinated (stand 24 h or [carbon filter](https://genetixbay.com/knowledge/glossary/carbon-filter.md) for [chloramine](https://genetixbay.com/knowledge/glossary/chloramine.md)) | pH as-is unless very alkaline |
| Soil moisture | Evenly moist; never dry, never saturated | Jardin uses VWC + soil temperature, dosing disabled [4] |
| Soil temperature | 18–24 °C (64–75 °F) | Biology slows below ~15 °C |
| Mulch | 3–5 cm (1–2 in) straw, leaves or living cover | |
| Top-dress | Between runs and mid-veg; weeks before need | Organic N release is slow |

## How to run it

1. **Build** (or buy) a mix of roughly equal parts aeration (pumice/perlite), compost/castings and peat or coco, plus a balanced amendment package. Let it "cook" moist and warm for 2–4 weeks.
2. **Plant** directly; water gently; mulch.
3. **Water** by weight or VWC; living soil wants steady moisture.
4. **Feed the soil, not the plant:** top-dress amendments and water in; compost teas or extracts by hand if you use them.
5. **Between runs:** cut stems at soil level, leave roots, top-dress, re-mulch, replant.

## Fixing problems

- Diagnose before amending: in living soil, pH or water problems and cold soil cause most "deficiencies".
- Fast-acting organic inputs (fish hydrolysate, kelp extract, a light foliar) bridge a gap while a top-dress breaks down.
- Pests: [fungus gnats](https://genetixbay.com/knowledge/glossary/fungus-gnat.md) love moist mulch; use [sticky traps](https://genetixbay.com/knowledge/glossary/sticky-trap.md) and [predatory mites](https://genetixbay.com/knowledge/glossary/predatory-mite.md) or *[Bacillus thuringiensis israelensis](https://genetixbay.com/knowledge/glossary/bti.md)* rather than drying the soil out.

## Jardin notes

Jardin medium "Living soil": dosing disabled in software, [EC](https://genetixbay.com/knowledge/glossary/ec.md) targets hidden; Jardin runs moisture, climate, photos and [IPM](https://genetixbay.com/knowledge/glossary/ipm.md) monitoring. Time-to-harm on pump failure: days. Automation level 3 for water [4].

## Common mistakes

- **Flushing living soil before harvest.** There's nothing to flush, and pre-harvest flushing is a *Myth* that costs yield and resin. Keep watering normally (see [the flush debate](https://genetixbay.com/knowledge/harvest-cure/flush-debate.md)).
- Small pots of "living soil" fed like hydro.
- Chlorinated or hydrogen-peroxide water, or sanitisers poured on the bed.
- pH-ing water to 6.0 out of habit.
- Over-amending (hot soil) and burning [seedlings](https://genetixbay.com/knowledge/glossary/seedling.md).

## Evidence

Soil-health principles are *Established* agronomy [1]. Organic feeding can produce high cannabis yields when N supply is adequate (~389 mg N/L liquid organic feed maximised veg yield in coir-based organic media [2]). Claims specific to living soil (better terpenes, "cleaner" smoke, microbial-driven quality) are *Grower practice* with no controlled cannabis data we can cite.

## Sources

1. USDA Natural Resources Conservation Service. Soil health principles (minimise disturbance, keep soil covered, maintain living roots, maximise biodiversity). https://www.nrcs.usda.gov/conservation-basics/natural-resource-concerns/soil/soil-health
2. Caplan D, Dixon M, Zheng Y, 2017. Optimal rate of organic fertilizer during the vegetative-stage for cannabis grown in two coir-based substrates. HortScience 52(9):1307–1312. https://doi.org/10.21273/HORTSCI12401-17
3. Raviv M, Lieth JH, Bar-Tal A (eds), 2019. Soilless Culture: Theory and Practice, 2nd ed. Elsevier (organic substrates and compost chapters). https://doi.org/10.1016/C2015-0-01807-5
4. GenetixBay Jardin engineering notes, 2026 (system profiles and failure margins).