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Pumice 4-20mm 25LTR


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Pumice is an ideal growing medium for plants. Growing healthy plants, is all
about the quality of the soil. Pumice has a variety of characteristics making
it useful throughout your garden. Coarse‐grind pumice rock makes an excellent
and attractive mulch for flower and shrubbery beds. The soil beneath the mulch
stays moist longer and is less likely to compact from watering. Weed problems
are minimized with a couple of inches of pumice mulch. It does not break down,
so does not need to be replaced. Also great for Composting. Pumice rock is a
great bedding additive to your worm composter. It adds additional air space,
prevents matting, and helps to control moisture.


It resembles a sponge because it consists of a network of gas bubbles frozen
amidst fragile volcanic glass and minerals. All types of magma (basalt,
andesite, dacite, and rhyolite) will form pumice. During an explosive
eruption, volcanic gases dissolved in the liquid portion of magma expand
rapidly to create a foam or froth; in the case of pumice, the liquid part of
the froth quickly solidifies to glass around the glass bubbles.

Its porosity provides air spaces that maintain aerobic conditions around the
roots while water is contained within the pores. Surface tension around the
outside of the pumice particles increases water-holding capacity of the
growing medium. Our pumice is mined from a land based resource, within 50kms
of Lake Taupo, the original source of the aggregate. As a result our pumice is
characterized by its relative hardness and lightweight in comparison to
competing aggregates.

The washing and screening of our pumice particularly for horticultural
applications means that no ‘fine’ particles are included. Unwashed pumice can
cause ‘concreting’ and higher water holding capacity than required,
consequently effecting root development. This hardness and porosity allows
free drainage lowering the risk of root-rot diseases.


Permanent, Weathered, Strong, Highly Porous, Inert, Long Life Growing Media,
extensively used in commercial Horticulture for a range of applications. pH
6.9 (near neutral out of the bag) Non-toxic and naturally proven by nature as
perfect for fresh water fish growth, abundant in volcanic regions like NZ,
proliferating with Trout and aquatic life, swimming in Pumice lined streams.
Pumice is clean ready to use, out of the bag. Abundant high quality, local
regional sources. 500 m2/litre of surface area for optimised bacterial
colonisation to enhance organic breakdown, just as nature intended. Pumice per
unit volume is inexpensive, sufficiently so, to be continuing to gain market
share in the commercial horticultural sector, bonzai, orchids, fruit trees and
numerous other specialist applications.


Pumice has a Zero Carbon Footprint. Minimal energy is required for simple
screen grading, solar drying & packaging. Compare this to glass which
requires nearly half a litre of petroleum equivalent energy value, for each
kilogram of glass products produced, energy needed to raise the temperature of
both new and recycled glass to 1,575 degrees C the melting/forming


Pumice is another ideal growing medium for cacti and succulents. The hardness
and porosity allows for drainage, lowering the risk of root diseases The soil
beneath the mulch stays moist longer and is less likely to compact from

Our pumice grades supplied for horticultural uses include: 1-2mm / 1-7mm /
4-20mm / 7-20mm


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SKU 9327719005333 Category
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