What is Zeolite 6–20mm and what is it made from?
Zeolite 6–20mm is a coarse, natural mineral with a porous crystal structure that helps with aeration, drainage, and nutrient retention. The 6–20mm size makes it ideal for larger containers, mature plants, and deep-root systems. It’s safe for general gardening use but not intended for ingestion.
What are the main benefits of using Zeolite 6–20mm in soil or potting mix?
Zeolite 6–20mm improves drainage, boosts aeration, helps prevent compaction, and holds onto water and nutrients for more efficient root access. It’s especially helpful for preventing root rot and smoothing moisture swings in heavy or overwatered soils.
Does Zeolite 6–20mm retain water and nutrients?
Yes—it holds moisture inside its pores while keeping the root zone airy. It also has high cation exchange capacity (CEC), which allows it to store nutrients like ammonium, potassium, and calcium and release them gradually. It won’t replace fertiliser but helps reduce leaching and salt buildup.
What types of plants and soils is Zeolite 6–20mm best for?
It’s ideal for mature succulents, cacti, bonsai, tropicals in pots, and raised beds. It also helps improve clay soil structure and boost nutrient retention in sandy soils. Suitable for indoor and outdoor use.
How does Zeolite 6–20mm compare to perlite, pumice, and bark?
Zeolite is heavier and more stable than perlite (no floating), holds nutrients better than pumice, and won’t decompose like bark. It’s a long-term structural amendment that resists breakdown while supporting moisture and nutrient balance.
How much Zeolite 6–20mm should I add to soil or potting mix?
Mix 10–30% by volume for most plants. Use 20–50% for succulents and cacti, or 10–30% in bonsai and large tropical mixes. It can also be layered at the base of deep pots, but mixing throughout the medium gives better results.
Should I rinse or charge Zeolite 6–20mm before using it?
Yes—rinse to remove dust and fines. Charging (soaking) in a mild liquid fertiliser or compost tea before use helps preload it with nutrients, making them more available to plants from the start.
Can I reuse Zeolite 6–20mm?
Absolutely. Rinse well between uses to remove residue and old roots. If needed, sanitise with hot water or a mild disinfectant, then let it dry fully before reusing. It doesn’t break down, so it lasts for years.
Does Zeolite 6–20mm add weight to pots?
Yes—it’s heavier than perlite or bark, which can help stabilise tall or top-heavy plants. Use trays or saucers underneath to protect surfaces, as the coarse particles can scratch floors or benches if dragged.
Does Zeolite 6–20mm support microbial life or compost systems?
Yes—its porous structure supports beneficial microbes and helps regulate moisture and airflow in the root zone. It can also bind ammonium in compost systems, reducing smells and nitrogen loss.
Can I use Zeolite 6–20mm as a top dressing?
You can, but it’s quite chunky. It can look clean and reduce evaporation or splashing, but may slow water infiltration. Water slowly to ensure it reaches the deeper layers evenly.
Is Zeolite 6–20mm good for hydroponics or semi-hydroponics?
It’s not ideal on its own for wicking systems due to its coarse size, but it can be used in blends with smaller mineral media. For true semi-hydro, finer grades offer better capillary action.
Can I grow plants in 100% Zeolite 6–20mm?
Some plants can handle it, but most perform better with Zeolite as part of a blend. Pure Zeolite can dry out quickly and requires careful feeding and watering. For most setups, mix with compost or other media.
Will Zeolite 6–20mm fix overwatering issues?
It helps by improving structure and drainage, but good watering habits still matter. Even with Zeolite, pots need drainage holes, and watering should follow actual dryness—not a schedule.
What’s the simplest way to use Zeolite 6–20mm successfully?
Rinse it, mix 10–30% through your potting mix (not just in the bottom), use pots with drainage, and water thoroughly—then let the mix dry before watering again. Feed normally, and flush occasionally to avoid salt buildup.
