Aeroponics Vs Hydroponics: A Look at Both Growing Techniques

by | May 6, 2020 | Hydroponics

There is a lot of confusion around the differences between aeroponics and hydroponics. Let’s take a deep dive into the differences, similarities, pros and cons, and discuss the best option for your garden.

What Is Aeroponics?

Aeroponics is a method of growing plants and vegetables without soil or any other growing medium. When growing aeroponically, the plant is suspended with the plant’s roots exposed, and then sprayed with a fine mist of nutrient-rich solution. 

Aeroponics allows you to be efficient with both your time and your natural resources. The plant’s root system receives more oxygen than their ground-living counterparts, as well as faster nutrient delivery, causing an incredibly quick rate of plant growth. And, according to NASA, aeroponic systems reduce your water usage by up 98%.

There are two kinds of aeroponics: High-Pressure Aeroponics and Low-Pressure Aeroponics.

What is hydroponics?

Hydroponics, on the other hand, is the process of growing vegetables or plants without the use of soil. But it can use another growth medium, like Rockwool, coco coir, perlite or vermiculite. When growing hydroponically, a nutrient-rich water solution then flows into the plant medium and is quickly absorbed by the plant. 

What is the difference between hydroponics and aeroponics?

Aeroponics is typically considered to be under the umbrella of hydroponics (as is aquaponics), but there are a handful of key differences between it and any other type of hydroponics.

Growing Medium

With most hydroponic methods and hydroponic systems, you use a growing medium such as perlite, gravel, sand, Rockwool or clay pellets. With Aeroponics, you do not use a growing medium at all. Instead, you allow the plant’s root system to be exposed directly to oxygen.

Watering

When using a hydroponic method, your plants are traditionally either submerged in a trough of nutrient-rich water or a regular flow of water is running through the growing medium. With aeroponics, the root zone is fed with a pressurized mist of nutrient-rich water. This spray is set on a timer (at least for high-pressure aeroponics), while with most forms of hydroponics the plants or growing medium are consistently in contact with water.

Resilience

If there’s ever a power outage or problem with your equipment, the pumps on your hydroponic system – aeroponic or otherwise – could shut off. A temporarily dead pump on most hydroponic systems isn’t a big deal, and the plants will likely be fine as long as the nutrient solution begins flowing again soon. For aeroponics, though, the plant’s roots are exposed and can quickly dry out and die without getting a regular spray of water.

Plant Security

With aeroponics, you don’t have a growing medium to keep the plants in place. To secure them, you’ll either need to use clips, foam sheets or even boards with holes. In other forms of hydroponics, plants are held in place with a variety of growing mediums, such as Rockwool. 

Skill Level

Hydroponics in all its forms, including aeroponics, is great options for faster plant growth in an eco-friendly way. That said, there are certain hydroponic methods that are easier than others. A simple hydroponic system can be set up with minimal effort or skill. 

Aeroponics, though, requires a system that sprays pressurized water upon your plants’ roots – often on a timer. If you’re planning to build your high-pressure aeroponics system, you will need to consider the pressure, the pump, the hole that sprays the water, as well as a way for keeping the plants in place and keeping the water contained. 

Even if you go the route of buying an aeroponic system, you will still need to regularly test the nutrients, monitor the plants, keep the system functional, etc. It can be a complex task for gardeners who are new to hydroponics. 

Types of Aeroponics

There are two primary forms of aeroponic systems: High-pressure aeroponics and low-pressure aeroponics although some people would lump fogponics into this category as well.

High-Pressure Aeroponics

High-pressure aeroponics (HPA) is the more effective, and debatably the purest form of aeroponics. It requires the nutrient-rich water mist solution to be sprayed with high pressure – at least 80 PSI through a small hole – causing an incredibly fine mist (We’re talking microscopically fine). The direct access to the root system improves the rate of nutrient absorption. Misting is set on a timer and then sprayed at intervals of three to five minutes. 

Low-Pressure Aeroponics

Low-Pressure Aeroponics (LPA), much like it sounds, refers to using a lower level of pressure to mist the plants. Typically, this system can be easily built using a sprinkler head, some tubing and a pump. While not as effective as HPAs, it’s still a good option that’s relatively easy to construct yourself.

Pros & Cons of Aeroponics

Aeroponics is a highly sophisticated way to grow plants, but like all methods, there are some pros and cons to consider. We’ll start with the good news:

Pros of Aeroponics

  • Higher yields than traditional gardening and other forms of hydroponics
  • Faster plant growth
  • Less time needed to feed and water your plants
  • Significantly lower risk of drying out
  • Better root zoneaeration than hydroponically grown systems
  • Significantly lower risk of overwatering 
  • Less water is used than traditional growing methods or other forms of hydroponics
  • Growing mediums aren’t needed
  • Plants can be moved without much effort
  • Easy to replace old plants with new plants
  • When growing indoors aeroponically, you don’t have to worry about growing seasons
  • Fewer pests
  • Less disease

Cons of Aeroponics

  • Plants are dependent on the system working correctly to keep from drying out
  • Root chamber requires regular cleaning to keep diseases away from the roots of the plants
  • More skill level needed to successfully operate the aeroponic system
  • Higher cost than other types of hydroponic systems.
  • Potential for one or more of the automatic systems/technology to fail
  • Can be noisy – not always great for small spaces

Soil vs. Non-Soil Growing Systems

Historically, agriculturists have mainly used soil for growing plants. But there have been advancements in technology and research that show some growing alternatives to using soil.

Growing mediums that are not made with soil are great for transferring nutrients and lack unwanted additions, like fungus, diseases, pests, or a number of pathogens that could be found in garden soil. Most hydroponic systems use these non-soil growing mediums. 

Similarly, when growing with an aeroponic system, you don’t have to worry about soil pathogens, because the plant roots are left exposed. 

Soil Limitations and Problems

I don’t want to be the guy that criticizes dirt, but when you grow your plants in regular soil, there are a lot of factors that can slow or inhibit your growth. Here are some of the downsides of growing in soil.

  • Plant growth takes longer
  • More maintenance needed, such as regular feeding and watering
  • Pests can potentially live in the soil and cause a serious threat
  • Weeds may be present in the soil
  • Diseases, mold and pathogens may be present in the soil
  • May be too dense to allow for air or water movement in a container

Alternative growing mediums, such as a commercial soilless mix are excellent options for either containers or most hydroponic systems. Unlike the soil, they don’t generally have diseases, insects, weeds or anything else unsavory living inside. Instead, they drain water incredibly well and are made up of materials like perlite, vermiculite, coconut coir, sphagnum peat moss.

And again, for the aeroponic system, there’s no need to choose which growing medium is best for you. Your roots will be just fine without being surrounded by dirt or anything else.

Conclusion

Aeroponics is one of the most misunderstood methods for growing plants, and yet it grows plants quicker than other forms of hydroponics and requires less water. And while it may take a little more upfront investment or engineering know-how, it’s a great option for the seasoned grower. 

Have you had an experience with Aeroponic systems? Let us know about it in the comments.

By Patrick Chism

By Patrick Chism

Patrick likes to pretend that urban gardening is just a hobby, but he’s actually prepping for the apocalypse. He’s a practical grower, specializing in hydroponics systems and grow lights. His dream is to one day feed his family with just the food he grows in his Chicago-based condo.

About Us

My husband and I are attempting to turn our tiny city condo into an urban gardening oasis. Join us on our journey toward sustainable living and making the most of our space.

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