Pumice vs. Perlite
The Heavyweight vs. The Lightweight. Both are volcanic, but only one stays put. Which one is right for you?
The Main Difference
Pumice
The Anchor
Heavier, durable, and stays mixed in the soil. Best for long-term structure and stabilizing tall plants.
Perlite
The Aerator
Lightweight, cheap, and effective. Best for seed starting, hanging baskets, and temporary potting.
Is Pumice Better Than Perlite?
It depends on your budget and goals. Pumice is generally considered "better" for long-term plantings (like Bonsai or large cacti) because it doesn't break down over time and doesn't float to the surface when watered. However, Perlite is significantly cheaper and lighter, making it the superior choice for large-scale gardening, seed starting, and hanging planters where weight is a concern.
Comparison Table
| Feature | Pumice | Perlite |
|---|---|---|
| Durability | Excellent (Lasts forever) | Moderate (Crushes over time) |
| Weight | Heavy (Sinks/Stays put) | Very Light (Floats) |
| Cost | Expensive ($$$) | Cheap ($) |
| Sustainability | Low Impact (Mined rock) | Medium Impact (Expanded by heat) |
| Best For | Bonsai, Cacti, Tall Pots | Seedlings, Hanging Baskets |
Which One Should You Choose?
Large Floor Plants
You need weight to keep the pot stable.
Winner: PumiceHanging Baskets
Weight is the enemy! You want it as light as possible.
Winner: PerliteSucculents Outdoors
Wind and rain can blow perlite away. Pumice stays put.
Winner: PumiceSeed Starting
You need a fine, sterile, and cheap medium.
Winner: PerliteBonsai
Requires permanent structure that won't degrade.
Winner: PumiceBudget Gardening
You have a lot of pots to fill and limited cash.
Winner: PerliteThe "Float Test"
The biggest complaint about perlite is that it floats.
Over time, perlite works its way to the top of your soil, creating a white "crust" that can blow away or wash out. Pumice, being heavier, stays mixed throughout the soil profile, providing consistent aeration from top to bottom.