Are you a plant parent who struggles with overwatering or constantly battles those annoying fungus gnats? You’re not alone. Many indoor gardeners are turning away from traditional soil and discovering a powerful, soilless growing method: semi-hydroponics with LECA.
This comprehensive guide will answer the most common questions about what is LECA, explain the incredible benefits, and provide a simple, step-by-step tutorial on how you can use this a game-changing medium to grow healthier, happier houseplants.
LECA is an acronym for Lightweight Expanded Clay Aggregate. It was developed in 1917 in Kansas City, Missouri.
LECA is made from baking clay in a rotary kiln. The clay is baked at 2,190ºF (1,200ºC) and form their roundish shape from the constant rotation while baking. During the heating process, gas expands making thousands of honeycomb like holes in the clay. This causes the clay to be more lightweight when compared to regular soil.
At its core, LECA is simply small, round pellets of baked clay. These little balls are created by heating natural clay to extremely high temperatures in a kiln. This process causes the clay to expand and become highly porous, forming a network of tiny air pockets inside. This causes the clay to be more lightweight when compared to regular soil.
The key properties of LECA that make it perfect for plants are:
Inert: It contains no nutrients and won’t break down, making it a stable, long-lasting medium.
Porous: It wicks and holds water, providing a reservoir of moisture for your plants.
Neutral: It has a neutral pH, so it won’t affect the acidity of your water or nutrients.
LECA makes for a superlative growing medium for most house plants. It’s odorless, eco-friendly, and reusable for starters.
Overwatering can be the main cause in plant loss for many plant owners. When a plant gets too much water the soil decomposes and compacts on the plants root system. In addition, waterlogged soil deprives the roots of oxygen and causes the root system to fail. Growing plants in LECA eliminates this common plant care mistake.
These little clay pebbles can completely take the guesswork out of when to water plants.
Here are some of the most important benefits of using LECA as a growing medium:
It’s an extremely porous medium – this means plenty of oxygen can get to the roots of your plants. Lack of oxygen causes root decay and disease which is often the cause of plant loss, especially in indoor plants.
I does not degrade – unlike other growing mediums, LECA does not decompose or compact over time. Soil compaction causes increased chance for root rot and disease. Because it does not decompose, it’s nutrient system and araitation quality does not change over time – this eliminates the need to repot your plants.
It’s cost effective in the long run – it is reusable. Plain and simple, you never need to buy more. You won’t need to remember the last time you changed the soil or buy more yearly, saving you money in the long run.
It’s environmentally friendly – LECA can be rinsed and reused as many times as you like. They are safe to dispose of and have no negative impact on the environment, unlike potting soil mixtures that typically contain synthetic fertilizers, non-degradable material (perlite for example.)
Inhospitable to bugs – due to the neutral pH and space between the large aggregate this medium is completely undesirable to pests. This prevents infestation of your plants unlike all other growing mediums.
Allergy free – LECA is a sterile medium, meaning it does not hold mold and bacteria. This means people with sensitive allergies can finally grow house plants.
Capillary Properties – is unique to LECA due to the fact that the clay draws up water and nutrients from a lower reservoir, supplying the root systems. This helps you from overwatering and flooding your plants.
Are you noticing the trend here? The key too healthy plants is all about having a healthy root system! The easier it is to monitor and tend to your plants root system, the healthier your plants will be.
LECA allows for optimal conditions to provide you with a healthy, happy plant.
It wouldn’t be fair if I didn’t discuss some possible drawback of using this medium as well. It’s important to know all the pros and cons when considering changing your plants growing medium.
Let’s discuss possible cons of using LECA before you consider taking the plunge.
Semi-hydroponics, often referred to as “semi-hydro” or even “hydroculture,” is a revolutionary soilless growing technique that is taking the houseplant world by storm. It’s a passive, low-maintenance method that makes plant care more predictable and less stressful.
Unlike pure hydroponics, where plants are suspended directly in nutrient-rich water, semi-hydroponics uses an inert, inorganic medium—most commonly LECA (Lightweight Expanded Clay Aggregate)—to anchor the plant’s root system. This material does not decompose, providing a stable, long-lasting home for your plant.
This method is also known as “passive hydroponics” because it doesn’t require any pumps or complex equipment. Instead, it relies on a simple, elegant principle: capillary action, or “wicking.” The porous LECA pebbles act like a sponge, drawing nutrient-rich water from a reservoir up to the plant’s roots.
Learn more about semi-hydroponics in my post How to Convert Plants to LECA: A Semi Hydroponic System.
This lightweight growing medium has become popular enough that it is easily found in most local garden centers such as Home Depot, Lowe’s and Walmart.
Over my years of using this medium, I have relied on two brands that consistently deliver quality: GROW!T and Hydroton. Both products have a reliable consistency in shape and size, which is essential for proper water wicking.
In my experience, the only real difference between brands comes down to slight variations in color, but this has not affected the health or growth of my plants.
Most plants will do well in LECA. Some commonly successful species are:
When you first get your LECA, you’ll need to rinse them. LECA comes with a fair amount of particle dust so you’ll want to rinse this off before using.
To do this, use a colander (designated for your LECA), rinse and rotate the clay pebbles until the water runs clear.
If you’re intending to reuse your LECA, it’s best to boil them. This will kill any algae or bacteria that can transfer from plant to plant. I boil mine and store them in a large container until I need them again.
You should only water your plants when the LECA is no longer in contact with the water reservoir. Checking in with your plants occasionally will help monitor levels.
I tend to change my water every two weeks. This helps me ensure my plants are receiving enough nutrients. However, the size of pot, type of plant, humidity in the house and time of year all can influence watering. Just keep those things in mind.
I believe price volume it is slightly more expensive (depending on what soil your comparing it to.) The reward is once you purchase LECA, you no longer have to buy more – unlike soil – because it doesn’t decompose.
The expense is in the set up of semi-hydroponic systems. You’ll need net pots and catch pots – so two pots per plant. This can get pricey, especially if you are repotting large plants. I recommend using net pots for plants needing <4″ pots. Switch to nursery pots, and just drill yourself some extra holes, for plants needing pots > 6″. It will cut your costs in half and work perfectly well.
Yes. You need to supply your plants nutrients when watering. The best fertilizers to use are those designed for hydroponics. I recommend Flora Grow and have seen great results when using it. I also recommend SUPERthrive in your water changes and when rooting plants in LECA.
Truthfully, no brand is more superior than another. I purchase mine online (due to convenience) and I typically order Hydroton in 10L bags.
However, if I’m being honest, the cheapest LECA I’ve found is from IKEA. That’s the best price on the market I’ve found for quality and quantity.
Switching to LECA can be a game-changer for your houseplant journey. With its numerous benefits, it’s a fantastic way to promote healthier growth, reduce maintenance, and enjoy thriving houseplants.
Have you tried growing houseplants in LECA? Share your experiences and tips in the comments below! We’d love to hear from you. Happy growing!
XOXO,
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I’m Maria, a lover of furry things, coffee and anything creative. This blog is where I love to share affordable home decor ideas, great DIYs, yummy recipes, unique crafts and so much more.
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4 thoughts on “What is LECA?: Learn to Grown a Better Houseplant”
Super helpful! Thank you. One question, how exactly do you use “SUPERthrive in your water changes and when rooting plants in LECA.”. Do you soak the leca in it?
Jennifer,
Great question. I add a little superthrive in a watering can and then fill. A cap full goes a long way! Once every other watering is plenty.
Happy growing!
XOXO,
Maria
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