Ausperl Horticultural Pumice Stone is a premium volcanic soil amendment from the Lake Taupo region of New Zealand. It is a porous, expanded volcanic rock, full of tiny air pockets that hold water and air right where roots need them, while the space between the pieces drains freely. The result is a mix that stays open and airy, holds moisture without going soggy, and gives roots plenty of oxygen.
Colour note: the stone looks white when dry and turns a soft golden tone when wet. Colour can vary a little with moisture level, lighting and natural variation in the stone.
Features
- Hard and durable, so it keeps its structure and won't break down or compact in the pot
- Holds water and air in its porous structure, then drains freely between the pieces
- Improves aeration and keeps mixes open and free-draining
- Reduces the risk of waterlogging and root rot
- Easy to blend through any mix
- Naturally pH neutral
Perfect for
- Succulents, cacti and other plants that like sharp drainage
- Bonsai and orchid mixes
- Potted plants that need more air around the roots
- Hydroponics and propagation
- Opening up heavy potting mixes
How to use
Mix pumice through the growing media rather than just sitting it in the bottom of the pot, so the whole root zone benefits.
- General pot plants: around 10 to 20% pumice where the mix needs better airflow
- Succulents and cacti: around 20 to 40%, depending on how free-draining you want it
- Bonsai: blend with other bonsai media such as akadama, lava rock, bark or zeolite to suit the species and your watering routine
Always match the ratio to the plant, pot size, climate and how you water. The aim is a mix that drains freely but does not dry out faster than the plant can handle.
Choosing your grade
- 1-7mm (finer): the everyday all-rounder. Best for general potting mixes, succulents and cacti, seedlings and propagation, smaller pots, and top dressing. Blends evenly through most mixes.
Specifications
- Hard, durable expanded volcanic pumice, sourced near Lake Taupo, New Zealand
- Porous and naturally pH neutral
- Available grades: 1-7mm
Sizes
Available in 1L, 2L, 3L and 4L
A note on natural variation: Because perlite is mined and heat-expanded from natural volcanic rock, the odd small stone or piece of unexpanded ore can make its way into the bag. It's completely harmless - it won't feed or hurt your plants, and it won't change how the mix drains.
Free tracked shipping Australia-wide.
After something coarser? We also stock Mineraland pumice in 6–10mm.