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.
Living soil is an organic growing medium managed to sustain an active soil food web, so microbes and invertebrates release nutrients and the soil is reused across cycles.Coco coir is a growing medium made from processed coconut husk, prized for holding water and air at once; it binds calcium and magnesium unless buffered.Rockwool is an inert growing medium spun from melted basalt rock into fibres, sold as plugs, cubes and slabs, that holds water and air in fixed proportions.DWC (deep water culture) suspends a plant's roots in an aerated nutrient solution, typically in a bucket with a net pot lid and an air stone.NFT (nutrient film technique) runs a thin, continuous film of nutrient solution along sloped channels, with roots resting in the stream and exposed to air above.Aeroponics grows plants with roots hanging in air inside a dark chamber, wetted by sprayed nutrient solution; low-pressure (LPA) systems use ordinary pumps and spray heads.HPA (high-pressure aeroponics) mists roots with very fine droplets from a high-pressure pump and accumulator, giving maximum aeration but little margin for failure.pH measures how acidic or alkaline a solution is on a 0–14 scale; in growing it controls nutrient uptake, with soil best near 6.0–7.0 and hydro 5.5–6.5.Runoff is the water or nutrient solution that drains out of the bottom of a container after irrigation; growers test it to see what is happening in the root zone.EC (electrical conductivity) measures how well a solution conducts electricity, a proxy for total dissolved salts; growers read it in mS/cm to gauge nutrient strength.SOG (sea of green) grows many small plants at high density with little or no veg time, each making one main cola, to shorten the cycle.Relative humidity is the water vapour in air as a percentage of what it could hold at that temperature, so the same RH dries plants differently at different temperatures.Drain-to-waste fertigation feeds each plant fresh nutrient solution and lets the runoff leave the system rather than returning it to the reservoir.A feed chart is a manufacturer's or grower's schedule of nutrient doses by week or stage; treat it as a ceiling to test against, not a rule.Input EC is the electrical conductivity of the nutrient solution going into the pot or system, in mS/cm, including the base EC of the source water.A recirculating (closed) system returns drained nutrient solution to the reservoir to be reused, saving water and nutrients but needing more monitoring and sanitation.
