Plant Glossary
What Is Pon for Plants?
Last Updated: September 2026 - Soil & Potting
Definition
Pon is an inorganic plant substrate, commonly made from mineral materials such as pumice, lava rock, and zeolite.
Quick Facts
| Plant term | Pon |
| Category | Soil & Potting |
| Also called | mineral substrate, plant pon |
| Common example | Aroids, hoyas, and some succulents are often grown in mineral substrates by experienced growers. |
| Care takeaway | Follow the planting instructions for your chosen system; some retain the original root ball while other conversions remove old mix. |
Also Called
Why It Matters
Pon combines mineral ingredients such as pumice, lava rock, and zeolite to provide drainage, air, and moisture around roots. It can be used in draining pots or compatible self-watering systems. Some products include starter fertilizer; the minerals alone are not a complete long-term nutrient supply.
How to Identify It
- ->Pon looks like a gritty mineral mix rather than round clay balls.
- ->Particles are usually smaller and irregular, often including pumice, lava rock, and zeolite.
- ->It is commonly used with self-watering pots or semi-hydro routines.
Care Notes
- ->Follow the planting instructions for your chosen system; some retain the original root ball while other conversions remove old mix.
- ->Use pots or reservoirs that let you monitor the water level, and avoid keeping newly transitioned roots permanently submerged.
- ->Flush the substrate regularly to remove fertilizer salts and mineral buildup.
- ->Check whether your pon product includes starter fertilizer, then use a complete hydroponic fertilizer when those nutrients are depleted.
Examples
Aroids, hoyas, and some succulents are often grown in mineral substrates by experienced growers.
Pumice-heavy mixes can improve drainage for plants prone to root rot.
Zeolite can hold nutrients, but pon still needs fertilizer management.
How to Water a Plant in PON
Start with your container: a draining pot and a self-watering planter need different routines. PON is the growing medium; it does not make every pot self-watering.
- 1. Mineral substrate
PON supports the roots inside a draining inner pot. - 2. Water connection
In this example, a wick carries moisture upward. - 3. Separate reservoir
Follow your planter's fill marks and instructions.
Pot with drainage holes
Water from above and let excess drain. Check moisture below the surface before watering again; dry-looking granules on top are only part of the picture.
Self-watering planter
Follow its settling-in instructions before relying on the reservoir. Some systems need an initial period of watering from above while roots establish.
Check for starter fertilizer before adding nutrients. Keep the plant's light and moisture needs in mind when changing substrate.
Manufacturer reference: LECHUZA watering systems (PDF). Instructions vary by planter.
Pon vs. LECA
Pon and LECA can both support semi-hydro routines, but they do not feel or behave exactly the same.
| Feature | Pon | LECA |
|---|---|---|
| Particle shape | Small irregular mineral pieces | Round clay balls |
| Water behavior | Wicks through small mineral particles | Holds moisture in clay pores and air gaps |
| Typical setup | Self-watering pots, mineral substrate | Reservoirs, net pots, semi-hydro conversions |
Related Glossary Terms
Related Guides
Frequently Asked Questions
No. LECA is expanded clay balls. Pon is usually a mineral mix with smaller particles such as pumice, lava rock, and zeolite.
Some pon products include starter fertilizer, but long-term growing still requires nutrient management.
Yes. Use a pot with drainage holes, water from above, and allow excess water to drain. Check moisture in the root zone and adjust to the plant rather than keeping a fixed watering schedule.
Check the planter instructions first. Some systems need an initial period of watering from above while roots establish. A newly repotted plant may not yet be able to use water stored below the inner pot.
Let Sproutly simplify plant care.
Identify plants, understand likely issues, and get care schedules that fit your home.