Short answer. Pick the system whose failure mode you can live with. Soil and living soil buffer mistakes for days; coco and rockwool for 12–48 hours; DWC for 2–12 hours if the air stops; NFT and LPA for 1–4 hours; HPA for tens of minutes [5]. Yield follows light, climate and the grower far more than the system: a meta-analysis of cannabis yield factors found light and plant density among the strongest drivers [1], and yield rose linearly with light in controlled trials [2]. There is no controlled study showing one system out-yields another at equal light. Beginners: soil or coco. First hydro: DWC or Kratky.
Side-by-side
| System | Forgiveness (time-to-harm on actuator failure) [5] | Daily attention | Measurement needed | Cost | Typical pH | Best for |
|---|---|---|---|---|---|---|
| Soil (bottled feed) | Days | Low | pH of water; occasional runoff EC | Low | 6.2–6.8 | First grow |
| Living soil | Days | Low | Moisture | Low–medium | 6.3–7.0 (not controlled) | Low-input, organic |
| Bottom-water / wick | Days | Very low | Tray level; occasional top EC | Low | Medium-dependent | Busy growers, soil |
| Coco (hand or drip) | 12–36 h | Daily | pH, EC, runoff | Low–medium | 5.8–6.2 | Fast growth, hydro-like control |
| Rockwool | 24–48 h | Daily | VWC/EC probe | Medium | 5.5–6.0 | Precision, crop steering |
| Ebb & flow | Days | Low–medium | pH, EC, reservoir | Medium | 5.6–6.2 | Many small plants, SOG |
| Recirculating drip | 12–36 h | Medium | pH, EC, runoff, refresh | Medium | Per medium | Water/nutrient saving |
| Drain-to-waste + steering | 12–36 h | Medium–high | VWC/EC probe | Medium–high | Per medium | Advanced/commercial |
| Kratky | n/a (no pump) | Low | Level, EC, water temp | Very low | 5.6–6.2 | Hydro on a budget, autos |
| DWC | 2–12 h (air) | Medium | pH, EC, water temp | Low | 5.6–6.0 | Fast veg, first hydro |
| RDWC | 2–12 h (air) | Medium | pH, EC, water temp, flows | Medium–high | 5.6–6.0 | Multiple large plants |
| NFT | 1–3 h | Medium | Flow, pH, EC | Medium | 5.6–6.0 | Clones, mothers, small plants |
| LPA | 1–4 h | Medium | Chamber RH, pH, EC | Medium | 5.6–6.0 | Aero without the risk of HPA |
| HPA | Tens of minutes to hours | High | Pressure, RH, battery | High | 5.6–6.0 | Experienced tinkerers |
| Fogponics | Hours (as sole method) | Medium | Tank level, EC | Low | n/a | Supplement only |
Decision guide
- Will you be away for 2+ days without automation? → Soil, living soil or bottom-watering.
- Can you check pH and EC daily? → Coco or DWC become options.
- Is your power or water supply unreliable? → Avoid NFT and HPA; prefer media-based systems.
- Hot room in summer (reservoir above 24 °C / 75 °F)? → Media-based systems, or budget for a chiller [4].
- Many small plants (SOG)? → Ebb & flow or coco drip.
- Want to steer for yield and quality with data? → Rockwool or coco on drain-to-waste with a VWC/EC probe.
Common mistakes
- Choosing hydro "for yield" and then running it in a hot, poorly lit room.
- Mixing system advice: soil pH and feed schedules in coco, or hydro-strength EC in soil.
- Building aeroponics before mastering a forgiving system.
Evidence
Failure-margin times are engineering estimates from GenetixBay's Jardin designbeing reviewed [5]. The dominance of light and density over system choice is Supported [1][2]. Root-disease risk in warm recirculating systems is Established [4]. Comparative yield claims between systems are Grower practice.
