October 25

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Does Potting Soil Go Bad? Your Guide to Potting Soil

Your plants need a home, and it is up to you to provide them with the best potting soil.

You want your plants healthy and happy, but where do you start? What is the difference between all of these different types of potting soil out there? How do I know which one will be best for my plant type? Does potting soil go bad?

Keep reading to find out more.

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What is potting soil?

What is potting soil and what does it do?

First of all, you need to know what potting soil is. Whether you’re dealing with bagged potting soil or your own recipe the basics are the same.

Potting soil, or potting mix, is made of composted bark, peat moss, sand, or perlite; it also usually contains chemicals like fertilizer and water-soluble charcoal (to help filter the water). Potting soils are specially formulated for use with potted plants grown in containers.

Why you should use potting soil

There are several reasons why you should use potting soil when you are starting your potted plants.

For one, it is designed specifically for the growing needs of container-grown plants, so it contains everything your plant needs to thrive.

It also doesn’t contain any large particles that could be harmful to your delicate new seedlings, or more tender container plants, and it will stay fluffy and loose in the container allowing air to reach the roots of the plant.

Common ingredients like peat moss and perlite help with drainage.

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Does potting soil go bad?

Does potting soil go bad? How to tell if your potting soil has gone bad

Does potting soil go bad? Potting soil will generally last a good long while before it becomes unusable.

Here’s how to tell if your potting soil has started to go bad:

– Bad potting soil may be showing signs of decay like mold or fungus. This is usually an indicator that it has also become home to insects and other pests, so don’t use it in your containers!

– If the potting soil looks wet and crumbly, this can lead to problems with drainage which will affect the health of your plant.

– If you find any clumps or lumps in the potting soil, then there is too much clay content; this kind of potting mix isn’t good for starting seeds because there won’t be enough space for the roots to grow.

– Old potting soil may have lost its nutrients, so be sure to check it before using if you are planting seedlings or young plants.

If your potting soil is looking funky in any way, don’t use it on your plants! Throw it out or give it away and start fresh with some new potting soil.

Common issues with old potting soil

Here are some of the most common causes of issues with old potting soil:

  • Unused potting soil left in the elements
  • Using garden soil as potting soil
  • Moldy potting soil
  • Fungus gnats
  • Using old potting mix for new containers
  • Expired potting mix
  • Lack of an airtight storage container

These sorts of issues can cause potting soil fresh out of the bag to go bad. Make sure you’re checking dates on any potting soil you’re getting from a garden center. Don’t reuse potting soil or re-pot with used potting soil. It’s very likely that used potting soil is lacking in nutrients and needs more amendments at the very least.

Used potting soil can also harbor fungus gnats larvae, blight, and mold. It’s your best bet to skip the old potting soil and get yourself a new bag of good quality potting soil each gardening season. You can also mix up your own potting soil with a mix of peat moss, perlite, and some other ingredients. We have included our seed starting mix recipe below.

The best types of potting soil for different plants 

Potting soils come in a variety of types.  Be sure you find something that will work best with the type of plant you want to grow in order to get optimal results.

For growing vegetables

The organic mix will be what you want. This kind of potting soil is often black in color and contains mulch, which helps with water retention. It contains natural fertilizers so you won’t have to feed your plants too often.

For young plants from the nursery

Use all-purpose potting soil. This kind of potting soil is not super fancy, but it works well for a majority of small potted plants because it contains composted bark and other safe ingredients that won’t make them sick when they start to grow.

For ornamental plants like flowers and shrubs

Look for a readymade potting mix that is light in texture that also contains vermiculite, perlite or sphagnum peat moss. These kinds of soils are perfect for adding water-retaining organic layers to the soil mix, without sinking too fast.

For seed starting

When planting seeds, use a coarse potting mix that is made of mostly composted bark and other safe items your plants won’t object to having around them as they grow. You can also make your own seed starting medium by mixing up equal parts shredded paper (easy for drainage), composted bark, vermiculite, and perlite.

Potting soil is easy to find at any garden center or home improvement store near you, but if you want to try something different don’t hesitate to experiment with mixing your own seed starting mix.

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Basic seed starting mix recipe

Basic seed starting potting soil recipe

  • 2 parts quality composted bark
  • 3 parts sphagnum peat moss or coir
  • 1 part perlite or vermiculite
  1. Mix the ingredients well enough to evenly distribute them, but do not over mix as this can damage the soil structure.
  2. Add water slowly and mix it into the potting mix gently.
  3. Keep adding water until the potting mix is moist with no dry lumps. Make sure you let all of your plants drain properly! If they sit in too much water they’ll die 🙁

There are many different kinds of potting mix on the market, so if you aren’t sure which one will work best for your plant then go ahead and ask someone at the garden center what kind of soil you should use.

Tips for storing your pots so your potting soil doesn’t dry out or get moldy

Pots that are drying out or getting moldy can kill your plants, so be sure to keep them moist at all times!

Here’s how:

– Always water your plants from the bottom to ensure they drain properly. Pots without a watering tray need something to sit in for bottom watering. Pots don’t sit well without them and drainage holes get blocked. If you pour too much water into them it will pool and make a mess + potentially drown your plants.

– Cover pots with plastic, and poke holes into the plastic for drainage. This will prevent plastic from sticking to the container.

– You can also store empty pots in water (but not ones with a growing medium as roots grow poorly underwater) which prevents them from drying out and dying.

– If your plants are inside the house, put them near a window where they’ll get plenty of light without getting too hot or cold. Direct sunlight can burn leaves and cause leaf loss or browning, so it’s a good idea to keep your seedlings away from windows that receive direct sun until they have grown larger and adapted to become stronger growers!

– Finally, don’t forget to check on your seedlings/plants every once in a while! Plants require attention just like any other living thing

So, Does Potting Soil Go Bad? Yes But It Takes Awhile and It Must Be Kept in Poor Conditions

We hope this gives you a great idea of whether or not your potting soil has gone off the deep end. Make sure you change out any potting soil you used in the previous season if you had any sort of blight or pest issue as it might still be in the soil.

If your soil looks at all funky it’s best to use new. It’s not worth it to spend all that time cultivating a plant in soil working against you.

Looking for more information on gardening? Check out some of our other articles here.


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does potting soil go bad, potting soil, seed starting mix recipe


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