The Fern blog
Why Fern works the way it does: the decisions behind the app, what we chose, and what it cost.
A birthday for every plant
Fern keeps two dates for each plant, the day it was born and the day it came home, and marks them once a year. What the birthday moment shows, how it stays quiet, what happens when several plants share a day, and what we haven't got right yet.
Badges for care, not for screen time
Fern's badges count things you do for your plants, and a calm day is any day when nothing you look after was left late, including days with nothing to do. How they work, whose care counts in a shared home, and what we still haven't settled.
Calm by design: how we keep Fern quiet
Plants are slow, and most days the honest answer to "what should I do?" is nothing. How we design an app around that, from the notification budget to the rules for celebrating, and what it costs us.
Care that follows the weather
When rain is due, Fern moves the watering for plants on a balcony. When frost or a heatwave is coming, it tells you once. How that works, where your location comes from, what's in Pro, and what we still haven't settled.
Every plant has a family tree
Plants come from other plants. Most apps treat each one as a stranger with a watering schedule. Why Fern keeps track of cuttings, babies, divided plants and gifts, and the decisions behind how it does it.
One home, many hands
Two people, one monstera, and the same reminder on both phones. How Fern decides who hears about each plant in a shared home, how care is covered while someone is away, who sees what, and what we haven't settled.
Polls, quizzes and the question that matters
Some things you ask other growers are a choice, and some are a plant in trouble. How polls, quizzes and questions work in Growers, and who gets to see your vote.
When a plant doesn't make it
Plants die, and the easiest thing a care app can offer is a delete button. Why Fern has a separate way to say a plant died, what it keeps and what it lets go, and how you can bring a plant back if you called it too soon.
Why Fern has a community, and why it starts with plants
A care app can tell you what a calathea generally wants. It can't show you one doing well in a flat like yours. Why we built Growers, the choices that shaped it, and the questions we still haven't settled.
Why Fern talks the way it does
The rules behind Fern's words, shown through real strings from the app. Why late care is "waiting since Monday", why the mascot stopped talking, and the places where the voice still slips.
Why Fern's spider mite course is 37 days
Most advice says to spray spider mites for a couple of weeks. Fern works a treatment's length out from the pest's life cycle, the room's temperature and the product's label, and shows its working down to the study each number came from. How that works for pests and diseases, the 105 sources behind it, and the popular drench Fern won't suggest.
Your home knows you. Growers know your plants.
Fern gives you two profiles, on purpose. The one your household sees, and a separate one you create for Growers. Why we built it that way, and what it keeps private without you having to think about it.
Your plants, your data
You can bring your plants into Fern from a spreadsheet or a screenshot, take everything out as files, and leave. What happens to your plants, photos, care history, home and Growers posts when you do, and the questions we haven't settled.