How much humidity does square-stemmed pelargonium need?

Square-stemmed Pelargonium is comfortable at 25-45% — which is ordinary indoor humidity in most homes. This is the good news people rarely hear: square-stemmed pelargonium does not need a humidifier, a pebble tray or daily misting. Typical living rooms sit between 30% and 50%, so unless you are running heating hard in a very dry climate, the air you already have is fine.

Nothing to do — normal room air suits it. If your home does get very dry in winter (heating on constantly, static in the air), simply moving square-stemmed pelargonium away from the radiator does more than any humidity gadget.

Buying humidity equipment square-stemmed pelargonium does not need. Misting in particular raises humidity for only a few minutes, and repeatedly wetting the leaves invites fungal spotting — the effort is worse than doing nothing.

Crisp brown leaf edges and browning tips are the reliable tell. Yellowing whole leaves is usually a watering issue rather than dry air, and slow growth in winter is normally low light — humidity gets blamed for a lot it does not cause.