With the garden service company that I own, I regularly have to deal with lawns that are infested with weeds. This is because weeds can be wind-borne, spread by lawnmowers, animals, birds or even on the soles of shoes. Weeds will become a problem where grass is poorly matted (this poor matting can be because the lawn was not planted or sown thick enough, not suitable for that specific area, or underfed). Weeds will germinate and grow in the gaps in grass.
Controlling of weeds can be done as follows:
Manually remove weeds, either one by one or in areas that are severely infested with weeds, the whole area can be dug out and replaced with new lawn sods. Just make sure the sods are weed free.
Alternatively, weeds can be controlled with a selective herbicide which is designed to control specific weeds in lawns. Because there are several types to choose from, make sure that you select the right one for the weeds in your lawn so that it will only eradicate the specific weeds in your lawn., otherwise it can be a costly mistake.
You can also attempt a controlled ‘spot’ treatment with a non-selective glysophate-based weed killer. But do remember that it will kill anything green. So apply it only to each specific weed. They are ideal herbicides for areas were persistent weed growth defeat all attempts at eradication. Glysophate-based herbicides can be applied by spraying, painting it on or dabbing it with a sponge.
However, if the weed is not unsightly, just ignore it and mow it along with your grass.
You can find out more about my services for gardening, cleaning and maintenance by visiting my homepage.