DIY Hydroponics for beginners

Welcome to the wonderful world of DIY hydroponics for beginners. 

Hydroponics is defined as the “process of growing plants in sand, gravel, or liquid, with added nutrients but without soil” by Oxford Languages.

We focus on the liquid part of the definition and use water and liquid nutrients. 

And you are going to love it.

Hydroponics can be just as simple or complicated and “sciency” as you want.

You can spend your days measuring EC and pH levels or choose to just get started.

The choice is yours, and you will find articles for both options here at Nordic Lavender.

But regardless of where your journey with hydroponics will take you, I advise you to keep it simple at first.

There is no reason to spend a lot of money on equipment and supplies when you first start out.

My first DIY Deep Water Culture (DWC) hydroponic grow system was built for less than $14 (12EUR). It looked almost exactly like the image above.

You can do a lot with just a few household items and then add equipment and tools when and as needed.

This is how to get started.

How I got started with my first DIY hydroponic system

Hydroponics made it possible for me, living in hardiness zone 7, to grow herbs and garden vegetables year round.

All of a sudden I could take climate and temperature out of the equation.

I remember sitting in the classroom on my first course in hydroponics and just smiling.

I got it. 

Deep Water Culture (DWC) beginner setup with no extra air
A DWC hydroponic system does not have to be complicated

My first installation was a classic DWC (Deep Water Culture) hydroponics system where I used a storage container, water soluble organic fertilizer and a regular table lamp for lighting.

No extra aeration. I made holes in plastic starter pots that had to serve as my net pots. Left over LECA pellets was used as a growing medium for my basil seedlings.

It worked. I was able to grow basil mid-winter and I was thrilled.

Now fresh herbs like basil need a lot of light to grow and develop into strong and healthy plants. My table lamp did not give sufficient light and the seedlings did grow leggy and the plants were truth to be told not the most impressive basil plants I have grown. But more importantly, it worked.

And I did not have to spend a lot of money to get my first DIY hydroponic system up and and running.

As it happened I had all the items needed already. But still, had I bought everything at our local hardware store it would have costed me less than a family sized pizza!

I was hooked and this was the first step to create my own hydroponic garden.

Your DIY Hydroponic system and what plants need

Hydroponic gardening is not that different from growing herbs, plants and vegetables using mediums like, for example, potting soil mixes.

A medium or substrate is simply anything that plants can grow in or on. 

And it does not have to be soil. It can be anything that offers structure and support for root development and delivers what the plant needs to grow.

If we keep it simple plants needs the following to grow and develop:

  • Medium (or substrate)
  • Water
  • Oxygen
  • Light
  • Nutrition
  • Heat (correct temperature interval)

If we can provide our plants with these components we will have healthy plants with strong plant roots.

So what is then so special about hydroponic gardening?

The basics are the same whether you grow using potting soil mixes or hydroponic grow systems.

When you grow plants using a DIY hydroponic system you do, however, use water as the main medium.

We plant our seedings in net pots filled with a medium (like leca) for support but we depend on the water to deliver the nutrition and in a sense give the roots access to oxygen.

When we buy potting soil it is full of organic matter that slowly releases nutrition over time.

Water does not hold any nutrients.

This is why you need to add liquid nutrients to your water in hydroponic grow systems.

Another difference is access to light when you grow indoors. 

There will most likely not be enough natural light in your house to grow plants using hydroponic grow systems. 

When you grow indoors you should invest in grow lights. And this is the main expense you will incur. And the price varies depending on what you buy. 

There are good inexpensive alternatives and I will show you great budget alternatives in my guides. But as a general rule you want a light that delivers 100 Lumen per Watt. 

Lumen per Watt is a good way to measure the efficiency of your light source. Watt measures your electricity consumption where Lumen measures the amount of visible light (brightness). 

Build your own hydroponic system

You can of course buy some really nice hydroponic systems. This is needless to say the fastest way to create your own hydroponic gardens at home. But it is also the most expensive.

Another option is to start your hydroponics garden the same way I once started. Use what you already have at home and just go for it.

Building your own DIY hydroponic garden is inexpensive and it works. But truth to be told your results will vary. You are also more likely to experience smaller harvests (poor yield) and problems like root rot.

And then there is the middle ground. My favourite way of gardening.

You spend a little bit of money where it matters. And then you build your very own high yielding DIY hydroponic garden.

Next we will look at 5 different DIY hydroponic systems you can build at home.

The DIY DWC hydroponic grow system

The DWC hydroponic grow system is the easiest system to build as a beginner.

Read our guide on how to build your own DWC system and then choose whether you want to add aeration or not.

The building blocks are basically the same though there is a difference in the setup and technique we use to grow and plant our seedlings.

There are 3 main variations of the DWC hydroponic system.

1. Non aerated DWC hydroponic system

You do not need an air pump to build a DWC system.

Instead you can leave a space in between the water level and the top of the reservoir. This setup will allow the roots to partly hang free in air, giving the root system access to oxygen.

This setup without an air pump works well if you allow the water level to decrease to help aerate the plants roots. Still, this system does leave the roots more vulnerable to root rot.

2. Aerated DWC hydroponics (using air pumps)

The DWC hydro system is created by adding an air pump and an air stone to our base DWC system.

DWC grow system with air pump and airstone
Add air to the DWC with air pump and airstone

We simply aerate our DWC by using an air pump and adding an oxygen stone to our water container. The oxygen added to the water gives the plant’s root system access to oxygen. 

This setup also allows us to fill our reservoir with water and nutrients all the way to the top.

Using this setup we are less likely to suffer from lack of oxygen and root systems suffering from root rot.

Root rot is easy to spot as root systems should be white and pleasant to touch. Roots suffering from root rot will be brown or dark and feel slimy to the touch.

3. DWC hydroponic float systems using a Styrofoam float

DWC float systems are merely an adaptation of the aerated DWC systems.

Instead of using a lid, we float a raft on the surface of the water nutrient reservoir solution.

The raft is typically made from a Styrofoam type material cut to fit the inside measurements of the reservoir. The DWC float system setup needs an air pump and an air stone to work.

Build a DIY Ebb and Flow hydroponic system

Ebb and Flow systems sound a lot more complicated than they are.

An Ebb and Flow hydroponic system is an ideal system for an indoor hydroponic garden and a good alternative for beginners.

If you choose a wide container you can quite easily create a year-round hydroponic garden with lettuce, arugula and other leafy greens indoors.

Ebb and flow offers a simple and efficient setup for any level of expertise
No need for net pots with an Ebb and flow hydroponic system

Ebb and Flow hydroponics are ideal if you want to grow different types of plants in one and the same hydroponic grow system.

We need two containers and a water pump to move water between the containers using pvc pipes.

One container is placed on top and will serve as our hydroponic garden bed.

The other container will be placed underneath and serve as our reservoir holding fresh water mixed with nutrients. The water pump will only run at certain intervals which also consumes less energy.

Again, it may sound complicated. But when you read our guides you will see that it is very straightforward.

Ebb and Flow is a very efficient and easy to use hydroponic growing system. The only disadvantage that I am aware of is that it is more complicated to clean compared to the DWC.

Build your own RGGS (Rain Gutter Growing System)

The RGGS can be used for hydroponic growing. And I do.

It is, however, also a self-watering system. You collect the rainwater in a container and use a valve to add water to your RGGS as and when needed.

I choose to focus on using the RGGS as a hydroponic growing system. But the system is ingenious and fits beautifully in any garden.

RGGS is, however, not well suited for indoor growing. 

Still I will show you how I build my RGGS to grow anything from tomatoes and chillies to herbs and leafy greens. 

Summary: DWC hydroponic is ideal for beginners

DWC systems are inexpensive and easy to set up and clean. And a DIY hydroponic system for beginners almost always start with a DWC system.

This is for a good reason. There is however one limitation you should be aware of.

The main disadvantage with DWC is that you have to grow plants that follow the same growth cycle in each DWC container.

Even when seedling are placed in separate net pots you still need to be mindful of the growth cycles.

You could for example not grow basil and oregano in the same DWC container. The basil seedlings would grow much faster than the oregano seedlings.

The basil plant would consequently consume the water and nutrients before the oregano seedling developed a root system large enough to reach the water and nutrients.

FAQ: DIY hydroponic garden

Meet the author: Mattias is an experienced gardener spending most of his free time on his knees among herbs, plants and garden vegetables. For the past two years he has been sharing gardening projects and how-to tutorials on the NordicLavender website and YouTube channel.