For some reason, flower growers, and summer residents too, insert matches into flowerpots with indoor plants and seedlings.
They say that this way you can deal with pests, namely annoying midges. Midges themselves do not cause much harm to plantings, but their offspring are just the opposite.
The more plants on the windowsills, the higher the humidity. And in a warm and humid environment, pests are not averse to settling - soil flies, for example.
They leave eggs in the soil, from which larvae emerge after a week and begin to damage the roots of plants.
Because of them, flowers wither, dry up, and die.
Flies will have to be caught with sticky tape, but matches are used against larvae instead of chemicals.
It is enough to distribute matches over the entire area of the soil in the flowerpot, grey side down, at a distance of 4-5 centimeters from each other and from the edge of the flowerpot.
In this case, you can continue watering if the soil is not over-moistened. The only thing you will have to do is change the matches as the sulfur dissolves.