If you are trying to get rid of weeds as quickly and as accurately as you can, one of the best ways to do it is to use a post-emergent weed killer. There are essentially four different types of post-emergent weed killers.
The first type of weed killer for lawns and gardens is a contact weedkiller. Basically you are going to be putting it directly on whatever you are trying to kill. If it comes in to contact with the poison, then the plant will die. If part of the plan doesn't come into contact then it won't. It is important to do a good job at getting the entire plant. Please note that this won't always work because some weeds will continue to grow even after you have killed them.?? Weeds like dandelions have very strong tubers and roots that allow them to grow back.
The second type of weed killer is a systematic weed killer. A lot of times people will use a systematic weed killer because they don't have to worry about whether or not you will kill the whole plant. Systematic weedkillers are absorbed into the plant and then they kill it from the inside out.
The third type of regional is a selective weedkiller. Basically it is designed for specific type of weed. And if you have that weed, it can be very effective at getting rid of it. It may not do a very good job on weeds that it is not specifically engineered for.
The last type is a non-selective weedkiller. A non-selective weedkiller will essentially kill everything. This includes weedkiller such as Roundup that will not only kill your grass but weeds as well. Non-selective reach those that are very popular for people to use in areas that they don't want weeds to spring up and grow.