Once you have taken care of as many seed stalks as possible, you need to kill the crab grass. The problem is that the fastest method to do this will also kill the rest of your lawn and that is not what most people want. However, if this is not a problem, you can use a chemical crab grass killer.
There are many lawns that can tolerate a chemical spray which has been designed for crab brass. However, not all varieties are safe and yours might not be. Of course, before you use any chemical killers, you need to carefully read the label and only use it as instructed.
There are many people who turn to weed killers to tackle their crab grass. The problem with these products is that they will generally kill any plant that they come into contact with. This means that the rest of your lawn will not be safe and you have to be careful around flower beds. If you are going to use chemicals, it is recommended that you use a crab grass killer as they are more selective than general weed killers.
If you want to avoid chemicals in your garden, you can always slice into the roots of the crab grass. Once you have done this, you can pull the weed up and discard it. This might not seem like a lot of fun, but it can be one of the best ways to eradicate these weeds.