Soil-moisture-based water flow
The porous clay cone opens and closes water flow according to soil moisture.
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Updated 5 months ago
Ceramic carrot-style sensor that opens and closes water flow according to soil moisture. It is part of the modular Tropf-Blumat drip spike system.

The porous clay cone opens and closes water flow according to soil moisture.
Its setting screw allows the slow, variable water release to be calibrated to plant demand.
Designed for outdoor use, the sensor inserts into moist soil near each plant and connects to thin drip tubing with a T-connector.
The Blumat Tropf-Blumat Automatic Watering Carrot Sensor is a ceramic soil-moisture sensor for the modular Tropf-Blumat drip spike system, designed to regulate water flow based on soil moisture.
The reviewer describes the system as an ingenious, reliable, and well-made non-electronic solution that effectively maintains container and balcony gardens throughout the summer. While the initial setup and configuration can be daunting, it is praised for its ability to provide custom, autonomous watering to multiple vessels.
This review compares the Tropf-Blumat to AutoPot systems, noting that while the Tropf-Blumat is an easy-to-install, electricity-free, and effective solution for automated watering, it can be somewhat finicky. It highlights that the system is better suited for commercial settings or specific soil types, and notes that it does not support pre-mixed liquid nutrients as well as other options.
The review evaluates the Tropf-Blumat against traditional timer-based drip irrigation, praising the Blumat for its water efficiency, lack of electrical components, and ability to adapt to the individual moisture needs of mixed plant types. It notes that the main common failure mode is air bubble formation, which can break the siphon.
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| Attribute | Specification | Notes |
|---|---|---|
| Adjustability | Yes | |
| Capacity | 200 ml | ml |
| Dimensions | Total length ~230 mm; insertion depth ~15-18 cm (Maxi); clay cone diameter ~20 mm (Min spec cited) | |
| Indoor Outdoor Use | Outdoor (intended use); Blumat Classic/Easy recommended for indoor plants (general guidance) | |
| Installation Method | Inserted “carrot”/sensor cone into moist soil near each plant; connect thin drip tubing to the sensor via T-connector (for Maxi: insert ~15-18 cm into soil and connect to water-supply tubing with T-connector) | |
| Material | Clay cone (porous ceramic/clay) with a plastic watering head (carrot sensor) | |
| Plant Compatibility | Outdoor plants on terraces, Balcony plants, Plants in greenhouses/polytunnel, Raised beds, Large pots and tubs (Maxi variant), Garden beds with planting depth around 25-30 cm (Maxi) | |
| Uv Resistance | Yes | |
| Water Release Rate | Slow; variable and adjustable via the sensor’s setting screw/calibration (tensio/valve) to match plant demand |

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