A room full of plants is one of the pleasures of a handmade home: trailing pothos along a shelf, a macramé hanger in the window, a fern on the floor beside the reading chair. Plants also put a surprising amount of water into the air, and in a small room that moisture has to settle somewhere.
Where the water comes from
Almost everything you pour into a pot leaves it again, through the leaves or off the surface of the compost. A dozen medium-sized plants can release roughly as much vapour in a day as a load of washing dried indoors. With a humidifier for the ferns and the windows shut all winter, that room carries far more moisture than the rest of the house.
Watch the cold corners
Moist air finds the coldest surfaces first: the glass, the window reveal, an outside wall behind a cabinet, and the corner where the ceiling meets two external walls. Droplets on the inside of the window each morning are the early sign.
The places to check are the ones your plants hide. Pull the shelf of pots a hand’s width from the wall and look behind it. Lift a woven basket cover and feel its base, because cotton and seagrass wick water from a damp saucer and stay wet for days.
When it is no longer the plants
A grey bloom on the compost surface is usually harmless and fades when you water less. Black spotting on a painted wall is a different matter, especially when it returns a fortnight after cleaning, spreads past the area behind the pots, or brings a musty smell to a room that otherwise smells of soil and leaves. At that point the wall, or the cavity behind it, is holding water the plants did not put there. For readers somewhere as humid as North Carolina, a Charlotte mold cleanup team can trace the cause, whether a failed window seal or a slow leak inside the wall, and no amount of rearranging pots will fix either.
Small habits that keep a plant room healthy
Group the thirsty plants so you water fewer spots, and empty saucers half an hour after watering. Stand pots on feet or a slatted stand so air moves underneath them. Open a window for ten minutes every morning, even in winter, or run a small dehumidifier on a timer. A cheap hygrometer on the shelf tells you whether the room sits above sixty per cent for long stretches, which is the level where mould begins to thrive.
Hang and arrange with air in mind
Leave a few centimetres between any hanging and the wall, and choose finishes on shelves and stands that can be wiped down. Rotate the busiest shelves once a season, so that no pot sits against the same patch of plaster all year and every corner gets a look when you move things round.
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