Can Fertilizer Kill Seedlings? (Everything You Should Know)

So, your garden is growing and you are wondering whether or not fertilizer can have adverse effects on your seedlings. I love gardening and it’s become my hobby for the past 12 years. Here’s what I know about fertilizer and seedlings: 

Organic fertilizer doesn’t kill seedlings. However, excess application of fertilizer can kill seedlings because fertilizer is salt. Matured plants may wilt or show signs of starvation if the wrong fertilizer is applied to them — but continue to thrive for a long time in the conductive growing environment.

The truth is you may not be able to tell the difference between regular fertilizer and a fertilizer designed for growing garden plants.

However, it is important to make sure that your plants get all the nutrients they need to grow. Regular fertilization just provides them with what they already need. But when you use a fertilizer designed for growing garden plants, it helps to give them all the nutrients they need and more.

When you apply fertilizer to your garden, it supplies your plants with the necessary nutrients they need. Fertilizer helps them to absorb carbon dioxide, nitrogen, phosphorous, iron, and other nutrients that are essential to the growth of your crops.

The nutrients are washed away from the soil as water and the residue provides the plants with the minerals and vitamins they need. These nutrients, in addition to the water, are the key to the success of your garden.

There have been many questions over the years as to whether or not can fertilizer kill seedlings. Although the majority of gardeners swear by fertilizers, there are still those who warn against putting fertilizer on your plants because of the possibility of it harming them.

However, when used properly, fertilizer can be beneficial to your plants and can actually help them grow better.

In order to use fertilizer correctly, you must make sure that you follow the directions that come with it carefully. When choosing a fertilizer, make sure that it is labeled with the correct amount of ingredients.

You should also make sure that you rinse any leftover fertilizer off of your plants thoroughly before you put them back into the soil.

Read Also:- Does Scotts Fertilizer Burn Grass? (A Beginner’s Guide)

Mixing Your Fertilizer

Fertilizer is made up of various elements and you must mix it properly in order for it to work properly.

The mixing process is often done by using water mixed with the proper ratio of nutrients. This is done by spraying the fertilizer directly into the soil so that it goes into the plant roots. By doing this, it ensures that the nutrients are sent to the plant.

Fertilizer can also be sprayed directly onto the ground so that the roots of the plant are directly exposed to the fertilizer.

If you have planted a garden in an area where you get a lot of rainfall, then you should avoid using fertilizers altogether because of the risk that they can run off into nearby streams or rivers and cause damage to the surrounding crops.

In fact, it may be best to simply use rain water when you are trying to grow your plants. Just make sure that the water doesn’t run into the soil until after it rains.

Then, you can use a sprinkler or a hose to spray fertilizer into the soil.

Another good way to ensure that fertilizer will not harm your plants is by making sure that you rinse out the fertilizer well when you clean out the last bit of dirt from the surface of your garden bed or tilling.

You don’t want the fertilizer to wash into nearby streams or rivers and cause damage to the aquatic life or the local fish population

Read Also:- What Fertilizer Does Randy Leon Use? (revealed)

What are Signs of Over Fertilizing?

When you over fertilize your garden, you are inadvertently creating more weed seeds than what they could ever produce.

Often times, your seedlings need just the topsoil to start growing, but since your soil is so depleted, it becomes impossible for them to reach the necessary roots to produce an actual harvest.

It’s no wonder that weeds become more common after you over fertilize. If you find yourself in this predicament, the following tips may help you avoid making the situation worse.

How Much Weed Do You Have?

There are a few things you should look out for when you are fertilizing. One is to look for excessive amounts of weeds.

Slow Release Fertilizer

Another is that you should use slow release fertilizers. The slow release type will actually work to decompose the over-fertilized matter, rather than allowing it to run off and multiply. This means that you will be reducing the weed population, and this can save your lawn from further damage.

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Organic Fertilizers are Better

You should also try to use natural fertilizers instead of store bought. Store bought fertilizers contain harsh chemicals, and you may actually be doing more harm to your lawn by using them.

Make sure that you go with organic products. While it can be expensive to buy natural fertilizers, you will save a lot of money in the long run. In addition, there are less harmful chemicals used to make these types of fertilizers, which means that they are much safer to use.

You should be careful about how much you water. It is not always the best idea to water your lawn thoroughly, especially when you are using store bought fertilizers. Instead, use a light hand. Watering often will help to keep the soil moist, which is exactly what weed seeds need.

You should use water that is room temperature, not hot or cold. Also, water only when your grass is going through the growing process, which means that the water is not getting lost in the heat of the sun.

As mentioned before, you can do a number of things to fix the problem of what are signs of over fertilizing. First, you should make sure that you are using natural fertilizers instead of store bought, and you should work to get the soil aerated as often as possible.

Be careful about how much water you are applying, and you should try to keep the lawn watered throughout the entire growing season.

You may also want to check into a weed seed timer, which can help to control over-watering. This can help to prevent weeds from growing and developing throughout the season.

Can you over fertilize your plants?

Of course, you can. If you have an open lawn space where you have a large number of weeds growing, then it may be time for you to seek out professional advice.

If your lawn has a lot of weed seeds, and you are applying high levels of commercial fertilizers, then you may want to consider using natural fertilizers and leaving the soil alone.

However, if you are having trouble keeping your grass healthy, and you see open areas where the weed seeds have appeared, then it may be time to take matters into your own hands and use some high quality commercial fertilizers in order to restore your lawn to its natural state.

Read Also:-  Dr. Earth Organic Fertilizer Review

Can Miracle Grow Kill Your Plants?

If you have been reading articles and books about how to best take care of your garden and yard, then you know that one of the best ways to do that is through using a “Miracle Gro” cleanse system.  

But what about killing your plants? Can Miracle Grow harm your plants

Miracle Grow will not kill your plants. Miracle Grow is rich in nitrogen and other essential nutrients needed by your plants to grow big, strong, green, and fast. However, if Miracle Grow is applied to your plants in the wrong proportion, it can burn the leaves and roots of your plants. But it’ll not kill the plants.

Now, let’s answer other common questions related to Miracle Grow.

Can My Plants Be Cleaned With “Miracle Gro”? The simple truth is, they cannot. There are two major reasons why this is true:

  • There are many toxins in our soil that are not able to be broken down by soil borne bacteria or other natural decomposers.
  • The soil that your plants grow in can contain heavy metals, pesticides, prescription drugs and other toxic chemicals which have been proven to be carcinogenic.

You may have seen infomercials or advertisements for products that claim to do just that. These products will only cleanse your soil, and they will leave behind traces of toxins in the water that you and your family drink.

They will also get rid of any extra nutrients that your soil has, and it may even kill some of your beneficial soil microbial inhabitants. Not good!

Read Also:- Osmocote Warning: Is this Fertilizer Safe?

Can I Use “Miracle Gro” to Prevent Disease?

Yes, you can, but it will not get rid of any harmful bacteria. If you are really concerned about keeping your lawn in healthy condition, you should make sure to purchase a commercial lawn fertilizer and soil conditioner that include all natural ingredients.

These products will increase the nitrogen level in your soil, and they will help keep your grass nourished during its growing season.

Don’t expect any miracles with this, though, because they will not get rid of any dangerous plant pathogens either. They might just slow them down!

Does Can Miracle Gro Cleanse harm my lawn?

It depends on whether or not you allow it to come in contact with your lawn. If you are someone who does not mind a bit of rough treatment in the name of better flower and vegetable gardens, then you may have no problem with using this powerful cleaner.

However, if you have a beautiful lawn that you would love to see bloom, and you want to make sure that it stays healthy, then you might want to steer clear of Miracle Gro completely.

Read Also:- How To Fertilize Tomato Flowers (Pollination, Fertilizer, Bees, Q-Tip)

Can I use a regular garden hose to do Can Miracle Gro?

You can if you are only trying to clear away existing weeds and dirt, but if you are looking to keep up with a larger-than-normal clump of unwanted matter, then you will probably want to stick with a power or water jetting system.

You can find them at most garden supply stores, as well as large home improvement centers.

Be sure to follow the instructions carefully, and always use high-quality equipment so that you don’t ruin your plants.


In the blog “Can Fertilizer Kill Seedlings?” on PlantGardener, discover the critical balance between nourishing your seedlings and unintentionally harming them. Uncover insights into the potential risks associated with fertilizer application, exploring common mistakes that might hinder seedling growth. Gain valuable tips on proper fertilizer usage to ensure the health and vitality of your young plants. Learn how to foster a nurturing environment for seedlings, avoiding pitfalls that could otherwise impede their development. Cultivate your gardening knowledge and safeguard the growth of your precious seedlings with expert advice from PlantGardener.

Read Also:-  Is Scotts Fertilizer Good? (9 Ways to Use It)


All in all, the right application of fertilizer to your plants will supply the required nitrogen, and other important nutrients that your plants need to grow strong and healthy.

However, you need to understand the type of plants you’re cultivating, as this would guide you on how best to use Miracle Grow, or any other plant food.

Read Also:- What Is A Good Fertilizer Schedule? (A Chart Guide)


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