Fernfriend

september 22, 2026 · 6 min read

Your window is the whole story

Why the same pothos needs water every 6 days in one apartment and every 13 in another, and how Fernfriend reads the difference.

by Maya Lindqvist

Most plant care advice is written for a plant that does not exist: one sitting in average light, at average temperature, in an average home. Your plant lives in a specific corner, and that corner decides almost everything.

Light sets the pace

A plant can only drink as fast as it grows, and it can only grow as fast as its light allows. A golden pothos on a south sill in July is running a marathon; the same plant across the room from a north window in January is barely awake. Water both every 7 days and you will underwater one and drown the other.

What we ask, and why

  • Which window: north, east, south, west, none, or a grow light. Direction tells us intensity and the hours of direct sun.
  • How close: on the sill, within six feet, or across the room. Light falls off fast; six feet back can mean a quarter of the light.
  • Your climate and hemisphere, once, in Settings. Dry indoor heat and a hot summer both shorten the gap between waterings.

From those three answers and the photo, the model reasons about that plant in that spot, and writes a rhythm and a plain-language light note: whether the spot suits it, and what to change if not.

Seasons do the rest

On Gardener, every rhythm shifts as the seasons turn. Winter stretches watering by roughly 40 percent and pauses feeding; summer tightens it. You do not have to remember any of this. You just have to tap Watered.

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