Plant Monitor for Home Assistant (Marketplace integration)

Installs: 5.3k sharing analytics
GitHub stars: 876
Connection: Not stated
Upkeep: Updated in the last 6 months
Version: v2026.9.0, October 27, 2026
Category: Garden and plants
Kind: Marketplace integration
Needs: Added as a custom repository in the Marketplace
Domain: plant
Source: github.com/Olen/homeassistant-plant
Issues: Report an issue

Independent directory, made by the developer of Vulpo. Not affiliated with Home Assistant or the Open Home Foundation.

Screenshots From the README of Olen/homeassistant-plant.

About

Plant Monitor is a custom integration that treats each plant as a device with its own sensors, thresholds and health tracking. Species data, thresholds and images can be fetched from OpenPlantbook, and without it the thresholds are entered by hand. Each plant can be linked to source sensors for temperature, soil moisture, conductivity, illuminance, air humidity, CO2 and soil temperature. It also calculates daily light integral from illuminance and vapour pressure deficit from temperature and humidity. Every minimum and maximum threshold is its own number entity, so it can be changed from the UI or by automations. Problem triggers can be switched on per measurement, and an action replaces the source of a plant sensor. Setup is done in the UI as a custom repository.

Automatic summary of the README and code of Olen/homeassistant-plant. Something wrong, or are you the maintainer and want your own text here? Get in touch

Supports

Device triggers Its devices can start automations directly.
From the Marketplace Installed through the Marketplace, formerly HACS.
Actively maintained Its author released or pushed a change in the last six months.

Provides

Sensors

Setting it up

Add its repository to the Marketplace as a custom repository and install it, then restart Home Assistant and add it under Settings, Devices and services.

Configure a plant

Plant name
SpeciesWill be used for searching OpenPlantbook

Select species from OpenPlantbook

Search for a different species
Species

Select sensors

Fill sensors from devicePick a device, such as a soil sensor, and submit the form to fill the fields below from its entities. The form opens again so you can review them before continuing; fields you have already set are kept.
Temperature sensor
Soil moisture sensor
Conductivity sensor
Illuminance sensor
Air humidity sensor
CO2 sensor
Soil temperature sensor

Set limits

This is the plant I was looking for
Plant species to display
Max soil moisture (%)
Min soil moisture (%)
Max illuminance (lx)
Min illuminance (lx)
Max DLI (mol/d⋅m²)
Min DLI (mol/d⋅m²)
Max temperature (see above)
Min temperature (see above)
Max conductivity (uS/cm)
Min conductivity (uS/cm)
Max air humidity (%)
Min air humidity (%)
Max VPD (kPa)

After setup

Illuminance check days
Species
Force refresh data from OpenPlantbook
Plant species to display
Image URL. Will be automatically updated if species is found in OpenPlantbook
Use illuminance as problem trigger
Use daily light integral (DLI) as problem trigger
Use air humidity as problem trigger
Use conductivity as problem trigger
Use soil moisture as problem trigger
Moisture grace period after watering (seconds, 0-86400)
Use temperature as problem trigger
Use CO2 as problem trigger
Use soil temperature as problem trigger
Use VPD as problem trigger
Fill sensors from devicePick a device, such as a soil sensor, and submit the form to fill the fields below from its entities. The form opens again so you can review them before continuing; fields you have already set are kept.
Temperature sensor
Soil moisture sensor
Conductivity sensor
Illuminance sensor
Air humidity sensor
CO2 sensor
Soil temperature sensor

Texts from the code of Olen/homeassistant-plant.

Entities

NumbersMax soil moisture, Min soil moisture, Max temperature, Min temperature, Max illuminance, Min illuminance, Max DLI, Min DLI, Max conductivity, Min conductivity, Max air humidity, Min air humidity, and 7 more
SensorsSoil moisture, Temperature, Conductivity, Illuminance, Air humidity, CO2, Soil temperature, PPFD, Total light integral, Daily light integral, DLI (24h rolling), Vapour pressure deficit

Actions

Replace sensorReplaces the source for a plant sensor.Fields: Meter entity, Sensor entity

Troubleshooting

DiagnosticsDownloads a diagnostics file to attach to a bug report.

From the README

A comprehensive plant monitoring integration for Home Assistant that treats each plant as a device with its own sensors, thresholds, and health tracking. Automatically fetches species data from OpenPlantbook to configure optimal growing conditions.
🖥️ UI-based setup — guided multi-step config flow with optional OpenPlantbook search
📊 Per-plant thresholds — each threshold is its own entity, adjustable from the UI or via automations
🌤️ Daily Light Integral — automatic DLI calculation from illuminance sensors
💧 Vapour Pressure Deficit — automatic VPD calculation from temperature + humidity
🔄 Live updates — change sensors, thresholds, species, or images without restarting HA
🚨 Problem detection — configurable per-sensor problem triggers
🔌 Auto-disable — sensors without a source entity are automatically disabled

From the README of Olen/homeassistant-plant, GNU GPL v3.0. Shortened.