Premium Cactus Substrate

Franky’s Flora Premium Cactus Substrate

For cacti, succulents and strong roots

At Franky’s Flora, everything is about healthy plants and a soil that truly works. Because worm compost is less suitable for cacti, we developed this Premium cactus substrate, specially designed for cacti and other succulents that need air, drainage and stability. No wet feet, no hassle — just a soil your plant will thrive in.

This substrate is made entirely from mineral components: lava, pumice and zeolite. This combination creates an open structure that allows excess water to drain quickly while still providing roots with enough air and support. Exactly what cacti need to grow strong and healthy.

Thanks to its coarse structure, plants remain firmly anchored, even larger or taller cacti. Ideal for pots, containers and permanent plantings, both indoors and outdoors.

Why I use (and sell) this substrate

Growing plants has been my hobby and passion since I was young. As a child, I was already busy with cuttings, mixing soils and discovering what worked and what didn’t. Over the years, I learned that the right soil is half the job — especially for cacti.

Because I run a worm farm, I naturally have plenty of worm compost available. But over time, I discovered that cacti simply perform better in a different type of soil. That’s why I’m truly happy with this substrate, specially developed for cacti.

I use this substrate myself in my own plants. No compromises, no marketing talk. Only products I fully stand behind are part of Franky’s Flora.

Specially developed for cacti

✔ Excellent drainage – prevents root rot
✔ Airy structure – supports healthy root growth
✔ Very stable – plants stay firmly in place
✔ Suitable for water-reservoir systems
✔ High mineral content – ideal for long-term planting
✔ Not fertilized – no weak, fast growth; you control the nutrition

Technical properties

• Grain size: 2–5 mm

• Composition: lava, pumice and zeolite

• Bulk density:

  • Loose: 0.70–0.80 kg/liter

  • Compacted (max. water capacity): 1.00–1.10 kg/liter

• Water capacity: 20–35%

• Water permeability: very high (200–400 mm/min)

• pH value: 6.5–7.5

• Salt content: low (0.1–1.0 g/l)

These properties ensure an excellent balance of water and air, even over long periods.

Delivery

Available as:

• Bagged product – 6 liters

• Big Bag – on request

Suitable for both hobby growers and professional use.

Franky’s Flora – with love for plants

At Franky’s Flora, it’s not about fast sales, but about quality, experience and a genuine love for green. Everything you find here is something I use myself or would recommend without hesitation.

So you — just like me — can calmly enjoy strong, healthy plants

Fully mineral substrate of lava, pumice and zeolite; unfertilised.

Use ready-made for desert cacti. Up to 25% worm castings may be added for epiphytic cacti.

• Available product variants: 1