It's not just us humans that need regular washing, but indoor plants too. Leaves need wiping down from time to time, since the dust that gathers on them blocks out light and impedes photosynthesis. Outdoors, any dust is quickly removed by wind and rain, but not so for indoor plants. That's why experts like those at the Plants & Flowers Foundation Holland will recommend wiping dust off the leaves about once a month. There are exceptions that tolerate darkness well, such as the cast-iron plant, spider plant and devil’s vine.

Source: The Star January 13, 2026 13:03 UTC