Home Plant guides What is Leca and why is it useful for plants?

Sanseveiras on Leca

What is Leca and why is it useful for plants?

Leca is an acronym and it stands for: Lightweight expanded clay aggregate. It sounds very complicated, but it's quite easy to explain. Essentially, Leca is a growing medium, like soil, in which you can grow your plants. Leca is a collection of baked clay balls that expand when you soak them in water.

Opposed to using soil, Leca is not able to provide nutrients to your plants by itself. So you might be wondering: why would you even consider using this for growing your plants? It's not even able to properly feed my plants. That's what you'll find out in this post. After reading this post, you'll understand why it's useful and you might even want to give it a try yourself.

In this guide, we'll go over these topics:

  1. What exactly is Leca?
  2. Why is Leca useful for growing your plants?
  3. What about nutrients?

What exactly is Leca?

Back to top Like I mentioned at the beginning, Leca stands for Lightweight expanded clay aggregate. In layman 's terms, this means that you have baked clay balls that can soak up a little water and they expand when they're soaking up the water. The water that's soaked up in the clay balls can be used to water plants. However, unlike soil, Leca is just a collection of clay balls and doesn't contain any nutrients. All they do is soak up a little water and expand accordingly. Any nutrients your plants need, you need to add into the water.

Why is Leca useful for growing your plants?

Back to top So now that you know Leca is just a collection of expanding clay balls, you might be wondering how this has any benefit for your plants. So here is a list of the benefits, after which we'll go through them, one at a time.

  1. It's easier to properly water your plants
  2. The risks of getting pests are reduced
  3. You can easily "check in" on your plants

It's easier to properly water your plants

As I've mentioned in "How to avoid overwatering your plants" the most important part of growing your plants in Leca is that the roots are not allowed to sit in water. So using Leca, you can create a raised bottom and raise your plants' roots from the bottom of the pot. You can add your water until it's just under the roots of the plants. Your plants will now be able to choose for themselves how much water they want. Because they're not sitting in water at all times, like often the case when using soil, they can sip on the water that has been soaked into the clay balls. If your plants are really thirsty, they will start to grow towards the water that's in the bottom of the pot and drink directly from that.

The difference for plants growing in Leca, compared to plants growing in soil, is that the plant chooses when to drink. When you're using soil, you're watering when the soil feels dry or the plant looks a certain way. This is much simpler when using Leca because you're watering when the water in the pot is gone. The plant has drunk it all or the clay balls have soaked it all up. Adding additional water, even if the clay balls are still full of water, will not cause the plant to be over watered. Because the plant chooses when to drink and how much. If you were to add more water when the soil is still soaked, you might kill the plant and over water it.

The risks of getting pests are reduced

As mentioned in the previous paragraph, you water your plants in Leca where there is no more water in the bottom of the pot. The plant will choose when to drink and avoid being over watered. Because it's very difficult to over water plants in this case, the chances of getting root rot are very low. This means that bugs won't be attracted to the rotting roots and soil. Fewer bugs mean fewer pests. Another reason why using Leca reduces pests is because unlike soil, Leca is not a live growing medium. Soil is organic matter, which nutrients and is "alive". This means that it could also contain nutrients for insects. Insects usually carry and cause deceases for your plants, so avoiding them altogether helps you to reduced the chances of dealing with a sick plant.

In fact, two of my Alocasias, the Zebrina, and Polly, were sick and their roots were rotting. This attracted insects and the plants almost died because of this. After switching them to Leca and cleaning them every single week, they've recovered and are now growing again like before. It's safe to say that those plants will never touch soil again.

You can easily "check-in" on your plants

When you're growing your plants in soil, the only time you'll really see the roots are when you're in the process of repotting the plant. In between planting and repotting them, you won't really know what the roots look like and how they're doing. However, when you're growing your plants in Leca, you'll be able to look at the roots every single day if you choose so. I'm not saying you should do this, because you really shouldn't. I clean most of my plants growing in Leca every week or once every two weeks. When doing this I clean the water, but also the clay balls. This gives me an opportunity to have a look at how the roots of the plants are doing. The picture at the top of this post is an example of this. I can look at the progress of the roots and adjust the placement of the plant in the pot accordingly.

The fact that you can "check-in" on your plant so easily is what helped me to save my Alocasias from dying. I was able to cut off rotting roots as soon as I saw them and prevent further rotting by cleaning the plant well. This took a lot of effort, but my plants are rewarding me by growing again.

What about nutrients?

Back to top I mentioned that Leca does not provide your plants with the nutrients they need to grow properly. Leca only takes care of watering your plants. As such, you'll need to add nutrients to water yourself. Most general hydroponics fertilizer is fine, but there are also specific types of fertilizer you can use to help your plants. These can range from growth hormones to fertilizer to help the roots grow faster and stronger. I personally have no experience with these are stick to a general hydroponics fertilizer. This has worked well so far, so it may be something you can consider using as well.

Conclusion

Leca stands for Lightweight expanded clay aggregate. Essentially it means they're baked clay balls that expand when you soak them in water. They're great as a medium for plants to grow in because it makes watering your plants much easier, you reduce the risks of getting pests, and you can easily "check-in" on your plants. The most important thing you have to think about when growing your plants in Leca is to never later their roots sit in water and to add a hydroponics fertilizer of some sort to your water. This way your plants get the nutrients they need and drink when they're thirsty. Hopefully, the benefits that Leca will give you may have been enough for you to give it a try!

Thank you for reading this post! I hope it helps you to keep your plants healthy and beautiful! If you're looking for more guides on specific plants, you can always request a plant guide or donate a plant in order to get a guide for the plant you have trouble with.

Tags: leca, water, pests

Posted on: April 13th, 2020 Last updated on: August 12th, 2020

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Frequently asked questions

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