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0-2 mm / 575 kg. m3
1-4 mm / 500 kg. m3
4-8 mm / 350 kg. m3
8-16 mm / 275 kg. m3

4-8 mm / 450 kg. m3
8-16 mm /350 kg. m3




2-8/D mm / 415 kg. m




LECA - Light Expanded Clay Aggregate

What is Leca?
Youve probably seen Leca without knowing it most commonly in plant pots. Its those little brown balls that resemble tiny potatoes. Leca is a wholly natural product made from clay, which boasts thermal insulation properties and has a plethora of horticultural/agricultural uses.

An acronym for Light Expanded Clay Aggregate, Leca is an environmentally-friendly product derived from a base clay. To manufacture Leca, clay is extruded into a kiln in pellets, heated, expanded and burned at extremely high temperatures. During the firing process, any organic materials are burned off, leaving a lightweight yet strong product which is impervious to dry rot, wet rot and insects hence its popularity in plant applications.
It can be purchased in the standard brown/terracotta pellet form or as a Leca Lightweight Soil, which is premixed.

What is Leca used for?
While its commonly used in building insulation due to its thermal conductivity, sound blocking and fire resistant properties, Leca is a valuable component in horticulture.
For a start, its commonly used in hydroponics (the method of cultivating plants not in soil but in nutrient-rich solutions). The product doesnt break down in water and can resist chemicals, thus its ideal for such applications, promoting growth.
Leca can be blended with soil to improve drainage, boost oxygen and improve growing conditions, or to reduce weight when using heavy soils. Its insulating properties make Leca the perfect medium for protecting roots from cold conditions, plus it can retain liquids and so water plants during periods of low rainfall.
The premixed Leca Lightweight Soil contains fertilisers and is a popular choice for green roofs it doesnt put undue weight on the structure, wont rot away and retains the water so you wont need to worry (too often) about trying to feed the grass and/or plants.
It is manufactured in several sizes and so can suit a variety of needs from 0.1mm in diameter to boulders ranging from 100-500mm. The smaller sizes can be mixed with cement to create a lighter concrete-like substance that is used to make fake rocks for gardens or as props.

Benefits of Leca
While Leca is lightweight, its incredibly strong. Plus, where the expansion process creates cavities in the individual pellets, Leca is also incompressible. It wont decompose and you wont have to worry about watering the soil as often as normal, provided the product has been given a good soaking beforehand.
As it allows increased levels of oxygen into the soil, Leca can lead to faster growth and can be used on structures that cannot take heavy loads providing a green solution where soil is not an option. Whats more, Lecas characteristics means that it wont change over time and so can be stored for a long while meaning you wont need to panic about it moulding in the shed.
The soil and Leca combination, which isnt packed as tightly as pure soil, leaves lots of room for roots to grow and expand, without tainting the plants with any unnatural substrates.
No matter your requirement - tidying your garden, agriculture, or construction Leca is worthy of consideration. To find out more and discuss your questions, contact us on 01458 441 122 or send us an enquiry.
More about Leca
What is Leca?
Leca in agriculture
Leca in construction
Buying Leca from Woodland
Related products: Leca 4mm-10mm | Leca 8mm-16mm | Intensive Lightweight Mix





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