Every week, Telegraph gardening expert Helen Yemm gives tips and advice on all your gardening problems whether at home or on your allotment. If you've got a question, see below for how to contact her.
Flies on house plants
Have you any advice on how to get rid of the little black flies that appear on windows next to house plants? I sometimes put the plants outside to let them fly away, but more seem to appear. Could the problem be in the potting compost?
– via email
The little flies are fungus gnats, also known as sciarid flies, that continuously breed by laying eggs in the top of your house plant compost, and are particularly attracted to compost containing peat.
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