Vermiculite (Super Coarse) — Professional Grade Moisture Control Amendment
Upgrade your mix with a clean, ultra-functional mineral that works behind the scenes to support stronger roots, better hydration balance, and long-term structure.
Our Super Coarse Vermiculite is expanded horticultural-grade vermiculite designed for serious growers who want control over moisture and nutrient retention — without compaction.
Why Growers Use It
Superior Moisture Control
Absorbs up to 3x its volume in water
Releases moisture gradually to the root zone
Prevents dry pockets in chunky mixes
Ideal for passive hydro & semi-hydro setups
It hydrates without suffocating roots — especially when blended with bark, coco, or perlite.
Horticulture Essential
Vermiculite naturally holds and buffers key nutrients like:
• Ammonium (NH₄⁺)
• Potassium (K)
• Calcium (Ca)
• Magnesium (Mg)

This improves nutrient availability and reduces leaching in fast-draining, soilless mixes.
Perfect for:
Aroid mixes
Seed starting
Propagation trays
Cuttings
Moisture-sensitive plants
Versatile & Long-Lasting
• Clean
• Odorless
• Non-toxic
• pH neutral
• Will not rot or mold
Unlike organic components, vermiculite does not decompose — meaning your mix structure stays more stable over time.
Structural & Insulating Properties
Beyond horticulture, super coarse vermiculite is valued for its:
• Fire-resistant qualities
• Insulating capability
• Lightweight structural properties
Commonly used in specialty cement blends, insulation, packaging, and industrial applications.
Why Choose Super Coarse?
Fine vermiculite can compact.
>> Super coarse grade maintains structure, improves aeration, and integrates beautifully into chunky tropical blends like those we formulate at Britney’s Urban Oasis.

If you’re building your own custom mix or refining drainage + moisture balance, this is a precision tool — not filler.
Best Used With:
• Fir bark
• Coco chips
• Coco coir
• Perlite
• Zeolite
• Moss pole blends
• Custom semi-hydro recipes
Grower Tested. Structure Focused. Moisture Balanced.
If you’re serious about dialing in your root zone, vermiculite is one of the most underrated tools you can add to your mix.