I’ve released a new custom integration for basic plant monitoring, after getting fed up with the official one being stagnant for years and others being overly complex or unmaintained.
Concentrating on moisture it allows you to set thresholds through the UI to control a problem sensor and automatically detect watering, so you know when you last watered.
You can also do summary notifications of what needs attention via an action, a simple example automation in the readme.
HACS Custom for now so you’ll have to click the handy My button or add the integration url to HACS custom repositories. HACS default submitted and will come at some point in the future.