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In prehistoric times 26 million years ago….seas and lakes were populated by diatoms, tiny single-cell creatures rich in silica.

Over time, these skeletons accumulated at the bottom of the lakes in which they lived.  Periodic volcanic activity added layers of alumna-rich ash to the mix and the Higromite material was born.  It is extremely porous and absorbent which allows for the efficient movement of air, water, and nutrients within your growing environment.

Key Benefits of Higromite

– Increased quality & quantity of yields

– Accelerates blooming and optimizes maturation

– High in Silica and inert

– Reduces the frequency of the watering cycle

– Increases porosity by establishing air & water passageways

– Allows the soil to absorb and hold water

– Promotes deeper roots and increases the number of fine root hairs

High Silica Content

Higromite is comprised of about 70% silica (Si).  Silica is essential for healthy plants and roots. The crystalline mineral silica is an often forgotten element in agriculture. When plants contain enough silica, they are able to maximize energy resources from the sun. However, it can only be absorbed gradually by the plant via the microbial processes in the soil.  Thus, it is important to “feed” the soil a rich organic diet.

Your plants will receive this slow release of silica from Higromite resulting in healthier, more robust plants.

Plant available silica has also been shown in studies to stimulate Systemic Acquired Resistance (SAR) in plants which increase their resistance to disease.

Moisture Release

Higromite has a total capillary porosity of about (68%).  The non-capillary pore space is made up of relatively large pores (18%) that conduct water under saturated conditions.  When drained, they are filled with air providing the oxygen that is necessary for root growth.

The capillary porosity is made up of small pores (50%)that hold water against the force of gravity, retaining much of it for plant use.

The high overall capillary pore space contributes to excellent hydraulic conductivity and moisture retention & release.

In the lab, increasing levels of energy are applied to samples to simulate dry down cycles.

Water released between saturation, 0 Tension and 0.03 Bars, reflects free drainage.  Of greater importance is the water that is released from 0.03 bars to 2 bars, which is considered plant available water.

Higromite can be used as a supplement to expanded clay, coco, rock wool, and other mediums depending on the application.

When Higromite is used as a supplement with Coco, it helps to reduce the common problem of compaction and increases moisture retention.

High CEC (Cat ion Exchange Capacity) – Due to its high CEC, adding Higromite to your soil can greatly improve the soil’s ability to hold onto the nutrients.

Higromite can also be applied to “lasagna gardening” techniques. When lining the bottom of a pot with Higromite, the root tips get the extra moisture they need in the later stages of growth. Expanded clays do not retain as much moisture as Higromite making it far superior.

Higromite can be applied as a top dressing to potted plants. The rocks provide an additional growing layer that protects against pests and helps retain moisture.

It also adds a nice decorative appeal that is pleasing to the eye.


The multi-faceted shape of the Higromite particles allows air penetration within the pot. This is particularly important to plant health and discourages root rot.

Capillary Action

The wicking action of Higromite ensures that the whole root system can take advantage of the water and nutrients you give it.


It does not break down like other media on the market today and can accompany your plant from seedling to specimen. Higromite can be re-used depending on the application.


Higromite eliminates the common problem of expanded clay floating in Ebb & Flow system buckets.  Higromite’s ability to retain moisture helps it create a stable growing environment in these applications.