Nature has been quite ingenious. Why not take advantage and see just how effective carnivorous plants can be!
For large houseflies and blue bottles you cant beat Trumpet pitchers (Sarracenia). They do need full sun though but if you dont have that try a large Monkey Cup - Nepenthes x ventrata is excellent.

Small flies such as fruit flies and compost flies will get caught by the Sundews (Drosera) - sun lovong plants, but if you have a north facing windowsill try a Butterwort (Pinguicula).

Buterworts are also exceelent at catching whitefly in the greenhouse or orchid house. Place underneath the foliage of other plants to keep out of the full sun.

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