How Long Does Fertilizer Last? Complete Guide

One of the biggest challenges in gardening is knowing how long your fertilizer will last before you need to apply more. It’s not like you can just look at the expiration date on the package since fertilizers don’t have expiration dates. So how do you know when to apply more fertilizer? I hope this complete guide will help you.

How Long Will a Fertilizer Last?

Here’s how you know how long fertilizer lasts:

Fertilizer contains three main ingredients – nitrogen, phosphorous and potassium (N-P-K). Fertilizers with a higher concentration of nitrogen will last longer than fertilizers with a higher concentration of phosphorous and potassium.

Fertilizers with a higher concentration of nitrogen also have a higher concentration of water, so they are less likely to burn plants than fertilizers with a high concentration of phosphorous and potassium.

The ratio of nitrogen, phosphorous and potassium in a fertilizer is listed on the package, along with the percentage of each major ingredient.

For example, a fertilizer with a 15-5-15 ratio will contain 15% nitrogen, 5% phosphorous and 15% potassium.

Most fertilizers also have a secondary ingredient, like micronutrients, which are listed as percentages or parts per million. These are important to have in the soil, but not in high concentrations.

So how do you know how long a fertilizer will last?

If you use a fertilizer with a high concentration of nitrogen, you will need to apply it more often.

Ideally, you want a fertilizer with a higher concentration of phosphorous and potassium.

If you are using a fertilizer with a high concentration of nitrogen, apply it every week. If you are using a fertilizer with a higher concentration of phosphorous and potassium, you can apply it every two weeks.

How Long Does Fertilizer Last in the Ground?

Now that you know how long fertilizer lasts, you might be wondering how long it lasts in the ground. And the answer is: it depends.

It depends on a number of factors including the type of fertilizer used, the soil type, the amount of sun exposure, the amount of rainfall, and how often the area is watered

Soil type and moisture

Fertilizers with a higher concentration of nitrogen will break down faster in sandy soils than in clay soils. Moisture also makes a big difference. The more water in the soil, the longer nutrients will last.

Soil temperature

The warmer the soil temperature, the faster nutrients will break down. If the temperature stays above freezing, nutrients will break down more quickly.

Rain or water

If fertilizer is spread on the soil and it is exposed to rain and water, it will start to break down. When this happens, the nutrients are leached out of the soil, and they will be washed away into the groundwater.

So what happens if the soil doesn’t get any rain or water? Well, in this case, the fertilizer will last longer.

How To Tell If Fertilizer Is Bad?

Fertilizer is very sensitive to moisture and oxygen. The longer it is in the bag, the more it will deteriorate. Also, if you can see moisture on the fertilizer, it may have been sitting in the bag for a long time and will not be good for your plants.

How to tell liquid fertilizer is bad?

One easy way to tell whether or not your liquid fertilizer is bad is to smell it. If it smells like ammonia and sulfur, it is bad. Another way to tell if it is bad is if it has separated into layers. This is a sign of the ingredients separating and has an acidity level of 0.5.

If liquid fertilizer has a 0.5 acidity level, it will have a bitter taste. If it has a 0.6 acidity level, it will taste like vinegar. If it has a 0.7 acidity level, it will taste like lemon juice. If it has a 0.8 acidity level, it will taste like wine.

How to tell granular fertilizer is bad?

One easy way to tell if your granular fertilizer is bad is to check the seed date. The seed date will tell you the date the product was made. It is also important to make sure that the product has not been opened. If the package has been opened, it is best to purchase a new package.

If you are still unsure about the product, you can do a simple test to see if the fertilizer is still good. Mix two cups of water with one cup of fertilizer. Place the mixture in a glass or clear container and leave it in the sun for 24 hours. If the fertilizer dissolves in the water and is free of any clumps and particles, it is good.

Another way to test the fertilizer is to place a few tablespoons in a small glass or cup. Add one tablespoon of water and stir it with a spoon. After you add the second tablespoon of water, if the fertilizer dissolves, it is good. If the fertilizer does not dissolve, it is bad or has been contaminated with another substance.

Why Does It Happen?

When fertilizer starts to break down, it can release nitrates into the soil causing nitrate burn. This is a toxic condition that can kill your plants.

What Can I Do If My Plants Have Been Affected?

If your plants have been affected by using bad fertilizer, you need to start using a plant tonic to help give them the nutrients they need to recover.

It is a liquid plant tonic that you can use to help your plants recover from almost any situation. It is great for helping your plants recover from overfeeding, too much sun, etc.

I have used it to help my plants bounce back from the above-mentioned situations over and over again.

This is one of my favorite nutrient products and I use it on all of my plants, including my indoor plants. It is safe for use on any plant and is perfect for a beginner grower.

How To Store Fertilizer

If you have a garden, you need to make sure that the plants are healthy and growing well. You can do this by fertilizing the plants.

However, you should not just use any fertilizer. You should only use high-quality fertilizer that is suitable for storage.

It is important to store fertilizer properly in order to prevent it from getting spoiled. In addition, you should only use a fertilizer that is still good for use.

You can learn how to store fertilizer by following these simple steps.

Fertilizer Go Bad FAQ

The use of fertilizer is a necessity for optimum crop production. The use of fertilizer is also a necessity for optimal soil health. There is no need to use synthetic fertilizers in organic farming. As land is cropped repeatedly, a build-up of nutrients occurs in the soil. As the soil becomes fertile, the plants become more resistant to disease, and the yield increases. However, when soils are overcropped or overgrazed, the fertility of the soil is lost. At this point, the soil needs to be replenished with nutrients.

The quality of the fertilizer is important. The soil is a living ecosystem, and the soil organisms need a balanced diet of minerals in order to thrive. But sometimes we have a lot of questions about this process! Does fertilizer go bad? How long does its shelf life last? Etc…

Does lawn fertilizer go bad?

So, can fertilizer go bad? Yes, lawn fertilizer goes bad. However, there is no set time to determine if your lawn fertilizer has gone bad but one of the telltale signs is a change in color or clumping. If your lawn fertilizer has changed color it is time to dispose of it. If you have a bag of lawn fertilizer that clumps together it is time to replace it.

Does liquid fertilizer go bad?

Liquid fertilizers have a really long shelf life ( between 8-10 years ). This is because they are stable liquid formulations that do not contain any active ingredients that are affected by heat.

Does weed and feed expire?

Yes, weed and feed will expire, usually about a year from the day you purchase it. You should be able to find an expiration date on the package. If you notice any signs of mold on the top of the weed and feed, it has expired. If you notice a bad smell, your weed and feed has expired.

How long do weed and feed last?

Weed and feed can last up to a year, but as we said above, weed and feed will expire after one year.


So, you can use fertilizer for a long time, but if you notice any changes in color or odor, you should not use it. A fertilizer that has a bad odor, or clumps together, it should be disposed of. Remember, it is important to use a fertilizer that is in good condition so that your plants can receive the nutrients they need.

I hope this guide will help you! Do you have any questions? Leave your comments below!


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