DIY Builds
Photo by cottonbro studio Pexels Logo Photo: cottonbro studio

What is difference between potting mix and potting soil?

Potting soil vs. potting mix: Though these terms are used interchangeably, there is a difference. Potting soil may or may not contain soil, while potting mix is strictly a soilless medium. Potting mix is sterile, which makes it safer for plants because it doesn't contain pathogens such as fungus or other diseases.

gardendesign.com - Potting Soil 101: Find the Right Mix - Garden Design
Does internal insulation cause damp?
Does internal insulation cause damp?

Internal wall insulation won't cause damp when installed correctly. However it shouldn't be installed if there is a problem with damp as...

Read More »
Last updated Sep 5, 2020
Should you paint the inside of a wooden shed?
Should you paint the inside of a wooden shed?

Painting the interior of a shed with white interior paint job is a good idea. It seals the wood, helps prevent mildew and insect damage, it...

Read More »
Last updated Aug 11, 2019
Can I build my own shed?
Can I build my own shed?

Yes, with the right plans you can build your dream shed.

Learn More »
Promotion

The topic of potting soil may not seem terribly exciting, but it matters greatly when it comes to the health of your plants. Potting soils were developed for plants that are grown in containers, which have different needs than those in the ground. All potting mediums are not created equal. Just as in nature, plants such as succulents require different soil than ferns. Different potting mixes were formulated to respond to those needs. Knowing what’s in your potting soil will allow you to give your plants what they need in order to be healthy and perform their best.

On this page:

WHAT IS POTTING SOIL?

Potting soil, also known as potting mix, is comprised of various ingredients that provide a healthy environment for potted plants to grow. These mixes are designed to keep the soil from becoming too compacted, which can suffocate roots and impede the flow of water and nutrients. A high-quality potting mix will be lighter weight and fluffy, with the ability to hold moisture. There are many different types of all-purpose blends, as well as more specialized mixes. There are several basic components that may be included in your potting soil: Organic plant or animal-based materials comprise the primary ingredients. These can include sphagnum peat moss, rice hulls, processed forest products such as aged or composted bark, manure, compost, bat guano, poultry litter, or earthworm castings. Coconut coir, a renewable resource made from coconut husks, is increasingly being used as a substitute for peat moss, which is less sustainable. Inorganic natural materials help to provide aeration, improve drainage, and retain moisture. These include perlite, vermiculite, pumice, sand, or cinders. (See below for more on the difference between perlite and vermiculite.) Fertilizers, which are the primary source of nutrients, can be all-purpose time-release fertilizers, synthetic blends or nutrient-dense organic amendments such alfalfa meal, bone meal, and kelp meal. Avoid potting mixes that contain chemical fertilizers, especially if you are growing edibles. Other additives may include lime to balance pH levels, beneficial microbes, and wetting agents to help retain moisture. Some brands have their own patented additives. Cheaper or generic brands may contain fillers such as garden soil or topsoil, which can compromise texture and quality. Though brand name potting mixes can be more expensive, they are worth the extra investment. Avoid potting soil that doesn’t list the ingredients on the packaging.

POTTING SOIL VS. POTTING MIX, GARDEN SOIL, AND TOPSOIL

Potting soil vs. potting mix: Though these terms are used interchangeably, there is a difference. Potting soil may or may not contain soil, while potting mix is strictly a soilless medium. Potting mix is sterile, which makes it safer for plants because it doesn’t contain pathogens such as fungus or other diseases. Potting soil vs. garden soil: Garden soil is a blend of soil and soilless ingredients that is used to improve garden beds. It is sometimes added to homemade potting mixes, but is not recommended for use by itself in containers as it can compact more easily, causing root rot and drainage issues.

How many hours of light does a greenhouse need?
How many hours of light does a greenhouse need?

six hours Greenhouses generally require six hours of direct or full spectrum light each day. If this can't be done naturally, supplemental lighting...

Read More »
Last updated Jan 11, 2022
Are brass or steel hinges better?
Are brass or steel hinges better?

Solid brass hinges never rust and are one of the best base metals to plate for the highest quality appearance. The finish on high quality brass...

Read More »
Last updated Apr 11, 2021

Potting soil vs topsoil: Topsoil is soil taken from the top layer of the earth. Quality can vary widely. Though it can be used in beds and borders, it’s also used for filling in holes, building berms, or other uses where quality is not a factor. Topsoil is less improved than garden soil and is not suitable for containers. Buy Now "BEST OF THE BEST" Proven Winners Premium Potting Soil was crowned "Best of the Best" by Best Reviews, calling it "a great all-around soil mix." They also note that it "drains well while remaining moist even in hot conditions" and "does not suffer from common issues like fungal growth or gnat infestation." Plus, the addition of dolomite lime buffers soil pH levels—perfect for vegetable and herb gardens.

TYPES OF POTTING MIXES

There are many different blends to respond to various plant needs. Here are some of the major types: All-purpose: Formulated for general indoor and outdoor use, including houseplants, hanging baskets, window boxes, ornamentals, herbs, and edibles. These can also be found under other label descriptions such as potting soil, potting mix, and container mix. Ingredients vary according to brand. Indoor potting mix: These include all-purpose or mixes specifically labelled for indoor plants. They are intended for general use for most houseplants. Look for blends that contain no compost or bark, which can shelter fungus gnats, a common indoor pest. Raised beds: Formulated for outdoor raised bed plantings, these mixes may be fortified with nutrient-rich ingredients for growing vegetables and other heavy feeders. Garden soil: This soil-based medium may contain organic or inorganic enhancements as well as fertilizer. It is intended for use in raised beds or in-ground garden beds. Seed starting mix: This soilless blend is lighter and quick-draining to encourage healthy root development. The fine texture promotes higher germination by allowing better soil contact with seeds, while the sterilized medium helps prevent growing issues such as damping off disease. (See more on how to start seeds). Cactus and succulent mix: These low-water plants prefer a leaner soil that dries out quickly. These mixes contain a higher ratio of perlite, sand, or other inorganic material to provide optimal drainage and allow air to the roots. African violet mix: These popular flowering tropicals prefer a warm moist environment that simulates their native jungle habitat. Formulated for extra aeration, improved drainage, and moisture retention, this mix can also be used for other houseplants.

Can I pour concrete over gravel?
Can I pour concrete over gravel?

Concrete can be combined with various substances in different building tasks. As individual materials, placing concrete over gravel is acceptable,...

Read More »
Last updated May 5, 2019
What is a coiling door?
What is a coiling door?

Coiling doors are metal slatted doors that roll up above the opening. As the door opens, it forms a compact coil. In comparison, a sectional door...

Read More »
Last updated Jun 23, 2020
These are the Best Shed Plans!
These are the Best Shed Plans!

Comprehensive and Intuitive to follow. Build That Shed!

Learn More »
Promotion

Orchid mix: Growing natively on tree bark in tropical rainforests, these exotic flowers require a soilless potting mix comprised primarily of bark chips. Charcoal and perlite may be added to improve drainage. This mix is also suitable for bromeliads and other epiphytes.

POTTING SOIL FAQ'S

What is the difference between perlite and vermiculite?

Does potting soil go bad?

Peat moss and other ingredients in potting soil decompose, resulting in compaction and a loss of nutrients. Used potting soil can become contaminated and develop soil pathogens. For optimal results, potting soil should be replaced at the beginning of each growing season. Opened bags should be used within 6 months, while unopened bags can last 1 to 2 years from purchase.

Can you reuse potting soil?

Used potting soil can be rejuvenated, though there is an increased risk of disease if not done properly. If the mix smells bad or is moldy, spread it out in the sun and allow to dry in order to kill pathogens. Add fresh peat moss or coconut coir to make the soil lighter. Nutrient-rich additives can include compost, earthworm castings, bone meal, and kelp meal. Used potting soil can also be recycled into flower beds, vegetable plots or the compost pile. Don’t reuse soil from a container where a diseased plant has grown.

Do you need to add fertilizer?

Containers are quickly depleted of nutrients due to regular watering. Even fresh potting mix that contains fertilizer will need supplemental nutrients. Midway through the growing season, apply a water-soluble fertilizer such as fish emulsion or seaweed every two weeks. PRO TIP: Our horticultural editor, Denise Kelly, recommends wearing a mask when mixing or working with potting soil—especially those with fine particles or manures. She adds, it can also be harmful to breathe in perlite or vermiculite, as these particles can get lodged in your lungs, and suggests wetting both products to eliminate airborne dust.

RELATED:

How to Compost

Fertilizer 101

Container Gardens

gardendesign.com - Potting Soil 101: Find the Right Mix - Garden Design
What adds value to a home?
What adds value to a home?

8 ways to increase the value of your home Clean and declutter. ... Add usable square footage. ... Make your home more energy-efficient. ... Spruce...

Read More »
Last updated Feb 28, 2020
How thick should plywood be for shed roof?
How thick should plywood be for shed roof?

Plywood thicknesses for roofs start at 3/8” in areas with light load requirements on rafters at 16” centers. Thicknesses of 1/2 to 5/8 inch are...

Read More »
Last updated Jun 28, 2022
How much would it cost to build a 10 by 16 shed?
How much would it cost to build a 10 by 16 shed?

Shed Cost by Size Size Average Cost (Labor Included) 10' x 12' (120 sq.ft.) $6,000 10' x 16' (160 sq.ft.) $8,000 10' x 20' (200 sq.ft.) $10,000 12'...

Read More »
Last updated Dec 24, 2019
Can I put solar panels on my shed?
Can I put solar panels on my shed?

Whether you use your backyard shed as a home office or gym—or keep it simple and use it for storage—you can harness the power of the sun with shed...

Read More »
Last updated Feb 3, 2022