# Ceramic sensor watering

> Ceramic sensor watering uses a porous ceramic cone in the medium that opens a small valve when the soil dries, feeding water from a gravity-fed reservoir on demand.

- Canonical: https://genetixbay.com/knowledge/glossary/ceramic-sensor-watering.html
- Also written: ceramic probe watering, ceramic cone watering, tensiometer valve watering, gravity-fed auto watering, auto-watering spikes
- Glossary category: Systems and media · Evidence: Grower practice
- Status: Draft: awaiting expert review · Updated: 2026-10-31
- Licence: CC BY-SA 4.0 (https://creativecommons.org/licenses/by-sa/4.0/), attribute "GenetixBay cannabis glossary"

Ceramic sensor watering is a generic class of passive auto-watering device. A porous ceramic cone filled with water is pushed into the medium. As the medium dries, it pulls water out through the ceramic, creating suction that opens a small valve on a supply line from a raised reservoir. When the medium is moist again, suction drops and the valve closes. It works like a tensiometer controlling a tap.

## In practice

These devices are popular in living-soil and organic grows, where they keep the soil evenly moist without pumps or timers. Set the sensitivity and placement so the medium stays moist but not saturated; most kits have an adjustment for this. Use plain water or very light teas rather than strong mineral solutions, which can clog the ceramic and valve. Clean ceramics between runs.

The trade-off: they hold soil at one [moisture level](https://genetixbay.com/knowledge/glossary/moisture-content.md), so there is no real [wet-dry cycle](https://genetixbay.com/knowledge/glossary/wet-dry-cycle.md); that suits [living soil](https://genetixbay.com/knowledge/glossary/living-soil.md) better than [coco](https://genetixbay.com/knowledge/glossary/coco-coir.md) or crop steering.

## Don't confuse with

- **Drip irrigation on a timer**: time-based rather than moisture-based.
- **Self-watering pot**: a wick or reservoir in the pot base.

## Related terms

[Bottom watering](https://genetixbay.com/knowledge/glossary/bottom-watering.md), [Wick system](https://genetixbay.com/knowledge/glossary/wick-system.md), [Living soil](https://genetixbay.com/knowledge/glossary/living-soil.md), [Wet-dry cycle](https://genetixbay.com/knowledge/glossary/wet-dry-cycle.md)

## Read more

- [Bottom-watering, soak trays and wick (self-watering) systems](https://genetixbay.com/knowledge/systems/bottom-watering-wick.md)
- [Living soil (no-till, water-only organic growing)](https://genetixbay.com/knowledge/systems/living-soil.md)