Roundup is a weed killer that is available in ready-to-use and concentrated formulations. Both of them have a long shelf life and must last for years if stored correctly. However, it is advisable to use them early and only buy the desired quantity so that age does not have any effect on their potency.
This article is dedicated to helping you understand whether Roundup can last forever.
Does Roundup go bad?
Roundup is basically glyphosate. This means that it is salt-based. The concentrate form does not go bad even after years of storage. You can use it without problems provided you store it safely and follow the instructions on the label.
The only time you have to worry about Roundup going bad or losing its potency is when it is stored with water. Once diluted with water, it becomes a salt-water mixture that should ideally be used within a reasonable period of time. If not, the salt will settle over a period of time and the water will be at the top.
Does Roundup expire?
Yes, it actually does. Roundup has an expiration date, which is clearly mentioned on the label of the bottle. The date is typically over a year after manufacturing.
How long does Roundup stay active?
It may not expire but does it always stay active? Is the potency still high? These are very good questions.
Once you mix the weed killer concentrate with water, you will have about 4 hours to use it. The diluted form will not stay potent beyond that.
As far as being active is concerned, the story is different. You must note that Roundup is an inactive formulation that does not work until it gets in touch with the plant. So, during storage, it is always inactive.
Does Roundup degrade?
This is another good question that must be answered because there are many fears about weed killers not being environment-friendly.
Roundup degrades and it degrades well, actually. Typically, it takes around 47 days (half-life) to completely degrade but we have also seen cases where this was high. A few times it took 200 days.
We advise that you store the concentrate in a cool, dark place or as recommended on the container. If you are using it after a very long time, the active ingredient may settle down at the bottom. To make sure you are able to use it properly, you should stir the contents of the bottle properly. This will mix the concentrate and give you a potent mixture.
Roundup or glyphosate is an excellent product to kill weeds and safeguard plants. It is easily available in garden stores and hardware stores. Storing it properly and understanding its expiration will help you make good use of it. If you have any questions about this, please feel free to ask us.