Get to the nearest garden center, and you’ll find loads of different types of soil. All sorts of labels and names, each with its own ingredients. They may look like they’re all the same, but they’re not. Therefore, price isn’t the only thing to pay attention to.
Learning to compare potting soil vs garden soil, checking ingredients and understanding how each type of soil works could make the difference between thriving and dying plants. That being said, this article will clear everything up and help you understand how gardeners choose and use the right soil for every specific growing environment.
Is Topsoil the Same as Garden Soil?
Topsoil, garden soil and other types of soil, that’s what you’ll find in gardening stores. But then, is topsoil the same as garden soil? They’re often used interchangeably and sold with misleading packaging, but there are quite a few differences.
Topsoil is basically soil. Dirt. Nothing else. It makes a good option if you need a cheap base for a raised bed, for example. However, it’s not suitable for long-term use by itself because it lacks balanced aeration and active organic life.
On the other hand, garden soil is a mix of topsoil and other extras. It has a bit of manure, some compost too, maybe some bark as well. All these extra ingredients add to its fertility and help loosen dense particles.
If you need loads of soil for your garden, you could add topsoil as the base, then top it up with garden soil. Otherwise, garden soil by itself is a better idea.
What Is Garden Soil?
Garden soil is a mix of general soil (just plain dirt) and other ingredients. It’s plain soil enhanced with different ingredients for fertility, composition and long-term success for your plants.
Garden soil could be enhanced with live microbes, manure, bark and compost. Before adding any of that, it helps to test your garden soil first, since pH and nutrient levels decide how much you actually need to amend. It’s an excellent option due to its heavy profile. It can also retain moisture, but without becoming clogged when integrated into a natural open landscape.
Given its composition, garden soil makes a good choice for raised beds and in-ground beds. It’s also suitable for gardens in general, yet a big garden may require quite a lot. Therefore, you could use something else as a base before topping it up with garden soil to keep overall project costs manageable.
What Is Potting Soil?
Potting soil varies in ingredients, depending on the brand. The cheapest form is nothing but soil or dirt. There are no other ingredients added to it, so it makes a good base for beds, but that’s it.
Some brands may also include a real dirt base, let alone a few extra ingredients, but that’s rare. All in all, potting soil is somewhere between garden soil and potting mixes in terms of results and uses.
What Is Potting Mix?
Is topsoil the same as garden soil? If not, then where does the potting mix go? Simply put, potting mix doesn’t have much soil in its composition. Instead, it’s a mix of ingredients that help with the final structure.
Potting mix is often based on vermiculite, perlite, coco coir and other similar ingredients. It’s light and drains fast. It’s ideal for pots and containers, so it’s a good choice for houseplants. Compared to garden soil, which includes dirt, clay or even sand, it won’t work well outdoors.
Topsoil vs Garden Soil vs Potting Soil vs Potting Mix at a Glance
Comparing potting soil vs garden soil and other types of soil could be tricky when they all look the same. Here’s everything at a glance.
| Product | Contains real dirt | Weight | Drainage | Sterile | Nutrients | Best use | Typical cost |
|---|---|---|---|---|---|---|---|
| Topsoil | Yes | Heavy | Slow | Completely unsterile | Natural, unforced minerals | Laws, holes | Cheap |
| Garden soil | Yes | Heavy | Slow | Not sterile | Localized compost | Garden beds | Middle priced |
| Potting soil | Usually soilless | Light | Fast | Mostly sterile or pasteurized | Rich in nutrients | Containers | More expensive |
| Potting mix | Usually soilless | Light | Fast | Sterile | Rich in nutrients | Containers | More expensive |
So, is topsoil the same as garden soil? As you can see, there are many differences between each type of soil, including prices, best uses and general characteristics.
Can You Mix Potting Soil and Garden Soil?
Is topsoil the same as garden soil? No, but different varieties could work well together.
Simple potting soil could work, but it won’t make your plants thrive. Replacing it completely with a different type of soil won’t be the best idea either. Instead, most gardeners recommend mixing different types of soil together to achieve a balanced blend of structure and organic biology.
In this particular case, stick to 70% potting soil and about 30% garden soil. Garden soil will bring in extra nutrients, such as minerals and microbes. Don’t be tempted to use garden soil exclusively, as it’s too heavy and dense for confined root zones.
This being said, you don’t necessarily need to compare potting soil vs garden soil. It’s never one or the other. Instead, in many situations, you’ll need to mix them in order to obtain the best possible results for your plants without restricting airflow.
Why Garden Soil Compacts in Pots and What Actually Fixes Drainage
Garden soil could potentially kill plants in pots, as it tends to get heavy, dense and compact. Since it’s based on clay, it will make drainage feel like mission impossible. Silt and sand in its composition make it even worse.
Things change 180 degrees when used directly outdoors, in your garden. Soil organisms can aerate your soil, which isn’t an option when you use it in pots. After all, this type of ecosystem is impossible to obtain in a pot where earthworms and deep drainage channels are absent.
A few watering sessions will turn garden soil into mud. Roots can no longer get the oxygen they require, so your plants will fade away and die. Fixing drainage implies mixing it with a different type of soil or replacing it completely with a dedicated container medium.
Now, does adding sand help drainage in pots?
Adding sand will make drainage even worse, as it packs into a concrete-like surface. It won’t happen overnight, but over a few watering sessions. That kills the drainage completely. Coarse sharp sand (also known as horticultural sand) will, indeed, help, as it doesn’t get that compact.
Grit and perlite help too. Grit feels heavy and will sink, so it’s good for fast drainage. It tends to settle at the bottom. On the other hand, perlite floats around and retains trace moisture instead. It’s better used throughout the soil, as part of a mix to maintain uniform porosity.
Should You Add Potting Soil to Your Garden Beds?
When setting up or maintaining a garden bed, you need to feed the soil. That’s your primary goal. From this point of view, adding potting soil isn’t necessarily the best idea because it’s mostly peat moss. It has little to no nutrients itself.
Sure, peat moss is handy when you want something cheap to cover more ground, but it won’t feed your soil. Instead, it makes more sense to get compost into your soil. It feeds your soil and helps plants thrive, regardless of what you want to plant.
Which One Should You Use?
Here’s a brief guide on what type of soil to use based on your needs, as well as small indications when undecided between potting soil vs garden soil.
- Potting mix for seed starting and houseplants or pots.
- Potting soil or potting soil and garden soil for large containers and pots.
- Garden soil, ideally cut with a bit of compost, for raised beds.
- Garden soil for in-ground beds.
- Topsoil for base layers or to fill low spots.
FAQ
Garden soil and potting soil are sometimes used or sold interchangeably, but mostly when they come from less reputable brands. For a real gardener, there are massive differences between them.
Garden soil is heavy and dense. It should be mixed into native soil, mostly in open ground.
Potting soil, on the other hand, is fluffy and light. It’s also sterile, let alone the extra ingredients. It’s suitable for containers, pots and houseplants.
Is topsoil the same as garden soil?
Topsoil is the natural outer layer of earth, so it’s basically dirt. It’s heavy and natural, but it’s based on sand, clay and silt. It’s great to fill holes, level lawns or even build a base for a bed. Garden soil is a mix of topsoil and other ingredients, such as organic matter like peat moss, compost and fertilizer.
Garden soil is what makes the difference in enriching flower beds. It can help plants grow and blend perfectly into the natural earth.
What’s the difference between potting mix and garden soil?
Potting mix requires engineering. It’s often soilless, but includes a sterile and lightweight mix. It’s ideal for pots and containers. On the other hand, garden soil is based on topsoil and organic matter. It’s excellent for outdoor uses.
What happens if you use the wrong one?
Garden soil compacts very easily, so it can suffocate houseplants and their roots when used in pots. Using it indoors is a terrible mistake that will usually kill plants. On the same note, potting mix is too light and fluffy for outdoor use.
Potting mix can, however, be added in low proportions to garden beds. It can be mixed with garden soil, yet garden soil should dominate the mix. That’s why it’s so important to know the differences when you compare potting soil vs garden soil.