Clay Pebbles

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Commonly known as Hydrocorn or Hydroleca, clay pebbles are an organic growing medium primarily used in recirculating hydroponic systems. Here at Green’s we stock only the finest Gold Label clay pebbles. Gold Label pebbles carry the renowned RHP certified stamp to indicate superior quality and to guarantee peace of mind with your purchase.

Clay pebbles are made by heating clay in a rotating kiln to 1100 – 1200 degrees Celsius. This heating process causes the clay to expand. The end result is a rough finished, highly porous medium that is excellent at retaining moisture, trapping air, and oxygenating any nutrient solution that flows over it.

Using clay pebbles will help speed up plant growth by providing plenty of aeration to the root zone. They also provide a great support structure to give your plants unparalleled stability.

Although most commonly used as a sole substrate in recirculating hydroponic systems such as drip or flood and drain systems, the properties of clay pebbles means they are often used by soil and coco growers as a base layer when potting (to increase drainage) and as a top layer (to reduce the evaporation from the top of the growing medium caused by grow lights).

Gold Label clay pebbles are PH stable and fully inert and are graded to measure 8-16mm in diameter. This uneven arrangement creates an advantageous environment to boost growth; offering plenty of opportunity for drainage, oxygenation at the root zone, beneficial bacterial growth, and root binding for superior stability. Watch our video to learn more (on the left under images).

It is important to note that this product is sold using the European standard of measurement which are slightly different to our standard measurements here in the UK. See FAQs below for the potting volume of these clay pebbles.

Gold Label clay pebble benefits:

  • Irregular shape and size for superior oxygenation and water retention
  • Encourages fast root growth due to aeration properties
  • Secure and stable medium for rooting
  • RHP stamped for guaranteed quality
  • Improves drainage of other growing mediums such as soil or coco
  • Reduces evaporation from other mediums such as soil or coco

Clay pebbles are widely used due to their ability to enhance plant performance and they work wonderfully in flood and drain and dripper systems (such as Wilma systems). Gold Label clay pebbles are high quality, versatile, and designed to help you get the most out of your plants - highly recommended.

***Please note we only ship the 45 Lite sack to mainland UK addresses***

Clay Pebbles FAQ's:

What is the RHP stamp?

RHP is a Dutch standard of quality for horticultural substrates and the premium stamp for all growing media. Any growing medium carrying the RHP stamp is guaranteed to be of a consistent high quality.

What are the European standards of measurement?

10L bag = 8L of pot volume
45L bag = 36L of pot volume

What amount should I add to soil / coco to improve drainage and reduce evaporation?

A good rule of thumb is to add about two litres of clay pebbles to the bottom of a 10-15L pot. You don't need to use that many to reduce evaporation. A layer or two on top of your soil / coco should be plenty.

Are they ready to use?

Yes, but we do recommend you rinse them with water before using them. A simple way to do this is to punch a few small holes in the bottom of the bag and fill the bag with a garden hose (from the top).

Can clay pebbles be re-used?

They can but make sure you clean them thoroughly before re-using and remove as much root matter as possible (using Cannazym can help break down old root matter). However, if you can afford it then we usually recommend buying fresh clay pebbles to ensure the best results.

Where can I learn more?

We've created a short video to sum up all the benefits / features of clay pebbles. Check it out and don't forget to subscribe to our YouTube Channel for more regular updates on products and 'how-to' tutorials:

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