Overly sunny or shady locations
Areas where the lawn meets concrete (e.g. along driveway and sidewalk edges)
These areas are particularly vulnerable to infestation because there is simply not enough healthy, nutrient-rich soil or grass present to crowd out aggressive weeds. Since the majority of local properties feature at least one or several of the problem areas listed above, many homeowners struggle with maintaining a weed-free lawn all year round.
Be careful not to over water. Loose, saturated soil can be a breeding ground for weeds. If you’ve seen regular rainfall in your neighborhood, supplemental watering may not be needed.
Thinning areas of the lawn
So if you cut a weed in half and leave it in the ground, it will grow. If you cut of both ends of it and leave a stalk there, it will grow into a new fuller weed.
Weeds grow and eat purely based on the soil and the sun, unfortunately, they don't need both, they only need one. While they will always grow towards the sun, they don't require it to survive, which is why we are able to see them in the first place.
So how do you get rid of them?
To answer this question, we have to address the fact that short of completely eviscerating the species forever, it's impossible. You can get rid of every root in your garden or lawn and if your neighbor doesn't keep care of theirs, it will grow into your yard.
But in short, you will need to take out every aspect of the roots and seeds in order to get rid of the weeds. This is where the term seed bank comes in. The fact is that weeds have started to realize that we don't like them in our garden, so in order to survive they have begun leaving their sproutlings dormant all over the place. This means that there will always be the possibility of weeds anywhere.
Weeds live underground and that is where they keep root. Weeds will branch these long veins in the ground and take root based on their seasons. Many common ones up here such as medusaheads and cheat grass are designed to stay hidden and dormant during the winter in order to survive. The idea is that each weed in its part will always be trying to grow.