Horticultural Zeolite for Potting Mixes, Bonsai and Roses, 5kg or 25kg Nutrient-Holding Grades

When fast-draining potting mixes lose nutrients too quickly, Horticultural Zeolite acts like a natural fertiliser battery. Its porous mineral structure attracts and holds nutrient ions, then releases them as plants need them, helping reduce leaching from containers and garden soils.

Use it across virtually all plants, including bonsai and roses. Zeolite also supports water infiltration and capillary distribution, so moisture and nutrients can move more evenly through the mix—especially useful under drip irrigation.

Choose Fine Grade 0.7–2mm for general potting mixes and garden soils, Medium Grade 2–6mm for many bonsai, orchids, cacti and succulents, or Coarse Grade 4–6mm for larger bonsai and drought-adapted plants. Available in 5kg and 25kg options.

Key Features

• Captures nutrients released by coated fertilisers in hot conditions, keeping them available to plants instead of washing away.
• Its high cation exchange capacity attracts ammonium, potassium, magnesium and calcium, helping mixes hold and release nutrients more effectively.
• The open, porous structure assists drainage, aeration and water infiltration while distributing moisture through the root zone.
• Zeolite does not break down in the mix, providing a lasting mineral component for repeated growing cycles.
• The mineral is marginally alkaline and supplies available calcium, which can help buffer pH when used alongside fertilisers.
• A general application guide is 1.25kg per 25 litres of soil or potting mix, equal to 50g per litre; sandy soils and roses may benefit from higher rates.

Specifications

• Material: Calcium/magnesium clinoptilolite zeolite.
• Certification: BFA Certified Organic.
• Fine Grade: 0.7 to 2mm.
• Medium Grade: 2 to 6mm.
• Coarse Grade: 4 to 6mm.
• Pack sizes: 5kg and 25kg.
• Suggested minimum application: 1.25kg per 25 litres of soil or potting mix.
• Suitable for virtually all plants, including bonsai and roses.

Select the grade that matches your plant’s root space and preferred drainage, then blend it through the growing medium before planting. For most small to medium bonsai, the 2–6mm grade balances aeration and moisture retention; larger bonsai and drought-adapted succulents often suit 4–6mm.