Kratky Method
A passive hydroponic method in which roots grow through a receding nutrient reservoir. As the solution level falls, the upper root mass takes in oxygen from the air gap while the lower portion stays in solution. No pump or electricity required.
Specs
- Setup cost
- $10–50
- Monthly op cost
- $0–5
- Footprint
- 1–4 sqft
- Typical draw
- 0 W (peak 0 W)
Strengths
- Zero electricity
- No moving parts
- Simplest possible setup
- Power outage immune
Weaknesses
- Single use reservoir per crop cycle
- Unsuitable for long harvest crops
- Poor fit for warm rooms without insulation
- No easy way to adjust solution mid cycle
Best for
Linked names lead to a full hydroponic guide for that plant. Unlinked names will activate as those plants are added.
Compatible plant categories
- Leafy Greens
- Herbs
Required equipment
- Mason jar or tote
- Net pot
- Growing medium
- Ph meter
- Ec meter
Sources
Data on this page is drawn from the following extension and research sources.
- Penn State Extension — Hydroponic Systems (accessed 2026-04-22)
- UF IFAS Extension — Hydroponic Systems (EDIS) (accessed 2026-04-22)