Improving pot drainage, preventing substrate compaction in professional potting, or lightening concrete mixes without sacrificing strength requires a calibrated inert mineral aggregate. This expanded perlite—also known as perlite or expanded volcanic glass—is supplied by Gardese in 60 L bags in two granulometries (Fine 1-3 mm and Medium 3-6 mm), designed for professional gardening, hydroponics, landscaping, nurseries, and lightweight construction projects where aeration and lightness are technical requirements.
Key Benefits
- Superior aeration and efficient drainage: the porous structure creates air cavities in the substrate, prevents waterlogging, and prevents root rot in pots and seedbeds.
- Neutral pH and chemically inert: it does not alter soil acidity or react with fertilizers, nutrient solutions, or construction additives, making it compatible with any mix.
- Structural lightness: very low specific weight significantly reduces dead load in large pots, elevated planters, and concrete mixes for roofs.
- Sterility and durability: sterile inorganic product, free of pests, weed seeds, and pathogens; it does not decompose, does not compact, and maintains its properties indefinitely.
- Selected Gardese origin: calibrated granulometry and controlled processing, which produces a homogeneous material in porosity and weight, a key condition in hydroponics and professional mixes.
Typical applications and uses
- Substrate mixes for pots, seedbeds, and urban gardens: combination with topsoil, coir, or peat moss to improve drainage and structure.
- Hydroponics: inert growing medium for recirculation systems, deep water culture, and vegetative propagation.
- Propagation: rooting of cuttings and germination of delicate seeds in hotbeds or misting.
- Lightweight construction: aggregate for lightweight concrete, leveling mortars, thermal fills, and precast elements.
Quality and durability
An economical perlite fails in two points: the grain comes with excessive fine dust (which reduces effective porosity when settled) and the calibration is irregular. Gardese works with expanded perlite calibrated by granulometry and processing that minimizes residual dust, which separates a professional-grade aggregate for hydroponics or construction from a generic bag that compacts or splashes dust when handled.
Its core function is structural: to create air pockets in the substrate and improve drainage, without adding nutrients or shifting the pH. It prevents the mix from compacting over time, which keeps oxygen available for roots and prevents rot from excess moisture. It is compatible with virtually any substrate (topsoil, coconut fiber, peat moss) and is added in proportions adjusted to the drainage requirements of the specific crop.
No. Perlite is an inorganic mineral (volcanic glass expanded by heat) and therefore does not rot, biologically decompose or chemically degrade. It keeps its physical properties indefinitely within the mix. The only possible change is slow compaction if the calibration is poor or if it's roughly handled; quality perlite holds volume and structure for years in normal use.
Yes — completely safe. It is a natural mineral, sterile, free of chemicals and certified as an inert medium for agricultural production. It is routinely used in commercial production of vegetables, fruits, culinary herbs and medicinal plants. It does not contaminate the soil, does not transfer substances to the plant, and is compatible with certified organic cultivation. The concern about chemical contamination does not apply, given that it is a purely mineral material processed thermally.
Opposite roles in the mix. Perlite prioritizes drainage and aeration: it lets water through quickly and creates air pockets. Vermiculite prioritizes moisture and nutrient retention: it absorbs water and releases it slowly. For seed trays and propagation that need constant moisture, vermiculite is preferred; for cacti, succulents and plants that hate waterlogging, perlite is preferred. In general substrates the two are often combined in proportions tailored to the plant.
Yes — a mask is recommended when handling dry perlite, especially when opening the bag and integrating it into the mix. The fine mineral dust can irritate airways and eyes from prolonged inhalation, although it is neither toxic nor carcinogenic. A standard dust mask (N95 or similar) and working in a ventilated area are sufficient. Once integrated into the moist substrate, the dust is not released into the air.
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| Particle size | 1 - 3 mm (0.04 - 0.12 in) |
|---|---|
| Volume | 100 L (26.4 gal) |
| Packaging | Bag |
| Sack: Width | 55.0 cm (21.65 in) |
|---|---|
| Sack: Height | 15.0 cm (5.91 in) |
| Sack: Depth | 95.0 cm (37.4 in) |
| Sack: Weight | 4.0 kg |
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