# SOG: sea of green

> Sea of green packs many small plants, usually clones, into the space and flowers them after little or no veg, so each plant makes one main cola. Higher planting density increases yield per square metre but lowers cannabinoid uniformity between plants, according to controlled research. Typical densities are 9–25 plants per m² with 0–14 days of veg; check local plant-count rules first.

- Canonical: https://genetixbay.com/knowledge/training/sog.html
- Category: Training · Level: Intermediate
- Evidence: Supported · Status: Draft: awaiting expert review (some figures are being checked)
- Stage: Veg, Flower · Systems: Any system
- 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 sea of green?** Sea of green (SOG) is a cannabis growing method that packs many small plants, usually uniform rooted clones of one cultivar, close together and flowers them after little or no veg. Each plant makes one [dominant](https://genetixbay.com/knowledge/glossary/dominant.md) cola, so the canopy fills with tops quickly and cycles run shorter. Plants usually sit in small 1-4 L containers, [rockwool](https://genetixbay.com/knowledge/glossary/rockwool.md) blocks or an ebb and flow table, with no topping.

**How many plants per square metre for SOG?** A sea of green typically runs 9-25 cannabis plants per square metre, about 1-2.3 plants per square foot. Belgian yield trials used 12-20 plants per square metre. Higher density raises yield per area but lowers [cannabinoid](https://genetixbay.com/knowledge/glossary/cannabinoid.md) uniformity between plants, according to controlled research, and airflow at the base gets harder as plants crowd together.

**How long to veg for SOG?** Veg a sea of green for 0-14 days under [18/6](https://genetixbay.com/knowledge/glossary/18-6.md) before switching to [12/12](https://genetixbay.com/knowledge/glossary/12-12.md), often flipping rooted clones almost straight away. Short veg is what keeps each plant to one main cola and shortens the cycle, giving more harvests per year. [Vegging](https://genetixbay.com/knowledge/glossary/veg-time.md) too long is a common mistake that recreates a crowded [SCROG](https://genetixbay.com/knowledge/glossary/scrog.md) with uneven, shaded growth.

**Is SOG legal where I live?** SOG may not be legal for home growers where you live, because it needs many plants, usually 9-25 per square metre, and plant-count limits in many jurisdictions make that illegal at home. Check your local plant-count rules before planning a sea of green. Even where it is legal, SOG needs a reliable clone supply, and one sick plant spreads disease quickly to its packed neighbours.

**Does higher planting density increase yield?** Yes, higher planting density increases cannabis yield per square metre, according to controlled research on drug-type cannabis, and density is among the strongest yield drivers in a meta-analysis of the cannabis literature. The trade-off is lower cannabinoid uniformity between plants and canopy positions, plus harder airflow at the base and faster spread of disease between neighbouring plants.

**Short answer.** Grow **many small plants** close together and flower them after **0–14 days of veg**, so each plant makes one dominant cola and the canopy fills with tops quickly. Higher density **raises yield per m²** but **reduces cannabinoid uniformity** between plants and positions, in controlled work on drug-type cannabis [1]; density is among the strongest yield drivers in the cannabis literature [2]. Typical SOG density is **9–25 plants/m² (about 1–2.3 per ft²)**; Belgian yield trials used 12–20 plants/m² [3][4]. **Plant-count limits** in many jurisdictions make SOG illegal for home growers; check your local rules.

## How to do it

1. Use uniform, rooted clones of one cultivar (seed plants vary too much in height and timing).
2. Small containers: 1–4 L (0.25–1 US gal), rockwool blocks, or an ebb & flow table ([ebb and flow](https://genetixbay.com/knowledge/systems/ebb-and-flow.md)).
3. Veg 0–14 days under 18/6, then 12/12.
4. Strip the lower third ([lollipop](https://genetixbay.com/knowledge/glossary/lollipopping.md)) at or soon after the flip; these buds would be larf ([lollipopping](https://genetixbay.com/knowledge/training/defoliation-lollipopping.md)).
5. No topping; maybe light [supercropping](https://genetixbay.com/knowledge/glossary/supercropping.md) to level outliers.

## Numbers that matter

| Item | Typical |
|---|---|
| Density | 9–25 plants/m² |
| Veg | 0–14 days |
| Container | 1–4 L |
| Cycle time | Shorter by the veg weeks saved; more harvests per year |
| [PPFD](https://genetixbay.com/knowledge/glossary/ppfd.md) | Full flowering intensity from day one ([PPFD](https://genetixbay.com/knowledge/environment/ppfd-dli-by-stage.md)) |

## Trade-offs

- **Pros:** fast cycles, [even canopy](https://genetixbay.com/knowledge/glossary/even-canopy.md), less training labour, simple irrigation.
- **Cons:** many plants (legal and clone-supply issues), uniformity drops with density [1], one sick plant spreads disease to its neighbours, airflow at the base is harder.

## Common mistakes

- Mixed cultivars or seed plants (uneven [stretch](https://genetixbay.com/knowledge/glossary/stretch.md)).
- Too long a veg, recreating a crowded SCROG.
- No airflow under the canopy.

## Evidence

Density effects on yield per area and on uniformity are *Supported* [1][2][3]. SOG-specific densities and veg times are *Grower practice*.

## Sources

1. Danziger N, Bernstein N, 2022. Too dense or not too dense: higher planting density reduces cannabinoid uniformity but increases yield/area in drug-type medical cannabis. Frontiers in Plant Science 13:713481. https://doi.org/10.3389/fpls.2022.713481
2. Backer R, Schwinghamer T, Rosenbaum P, et al., 2019. Closing the yield gap for cannabis: a meta-analysis of factors determining cannabis yield. Frontiers in Plant Science 10:495. https://doi.org/10.3389/fpls.2019.00495
3. Vanhove W, Van Damme P, Meert N, 2011. Factors determining yield and quality of illicit indoor cannabis (Cannabis spp.) production. Forensic Science International 212(1–3):158–163. https://doi.org/10.1016/j.forsciint.2011.06.006
4. BELSPO MARCANT project summary (plant densities 12–20 plants/m² in yield trials). https://www.belspo.be/Belspo/fedra/DR/DR92_MARCANT_summ_en.pdf