HOUSEPLANT SOIL
By Gemini
london,
United Kingdom 
I HAVE VARIOUS INDOOR HOUSEPLANTS ON WINDOW LEDGES WHICH HAVE DEVELOPED A WHITE 'FILM' OVER THE SOILS . A NEIGHBOUR HAS SAID THAT THIS IS A FORM OF ROT AND I SHOULD CHANGE THE SOIL. ARGUING THAT THE PLANTS ARE STILL THRIVING AFTER SEVERAL MONTHS IN SUCH SOIL AND I DON'T REALLY WISH TO DISTURB THEM -,WHO IS ACTUALLY RIGHT ON THIS ?
16 Feb, 2009
Answers
You could take off the top couple of inches and replace it with fresh, then you should cover the top with a layer of horticultural grit.
16 Feb, 2009
I agree with Andrearichter. Compost eventually degrades and needs replacing.
16 Feb, 2009
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Don't worry Gemini, the white film around your pots is a harmless fungus for large plants. Do not repot if your plants are doing well. Cover the film up with small pebbles or large grit.
16 Feb, 2009