Pumice

Pumice is a lightweight volcanic rock formed when lava cools rapidly with trapped gas bubbles. The result is a porous stone full of tiny air pockets that make it exceptionally useful as a soil amendment. Unlike synthetic alternatives, pumice is 100% natural, pH-neutral, and will not break down over time.

When mixed into soil, pumice creates air channels that allow roots to breathe while preventing waterlogging. It absorbs excess moisture and releases it slowly back to the roots, striking the perfect balance between drainage and water retention. This makes it one of the most versatile soil additives for Philippine gardeners, especially for plants that are prone to root rot in our humid tropical climate.

Key Properties

• ✓ Lightweight — easy to handle despite the large bag size
• ✓ Porous — tiny air pockets improve drainage and root aeration
• ✓ pH-neutral — will not alter your soil's acidity or alkalinity
• ✓ Reusable — rinse and reuse across multiple planting cycles
• ✓ Does not decompose — permanent structure unlike organic amendments

Both pumice and perlite improve soil drainage, but they are not the same. Pumice is a natural volcanic rock, while perlite is a processed volcanic glass that has been heated to extreme temperatures. Here is how they compare for Philippine gardening conditions:

Our recommendation: For Philippine gardeners, pumice is the better long-term investment. It will not float to the top of your pots during heavy monsoon rains, it lasts indefinitely, and it can be reused every time you repot. Perlite works in a pinch, but you will end up replacing it regularly.

The right pumice-to-soil ratio depends on what you are growing. Plants that need fast drainage get more pumice; plants that prefer consistent moisture get less. Here are our recommended ratios for common Philippine plant types: