Therm-O-Rock Vermiculite Horticultural Media
Best fine-grade amendment for organic seed starting and delicate root propagation.
A high-performance mineral amendment that optimizes soil structure for better water and nutrient management. It is the ideal choice for gardeners prioritizing strong root systems and successful seed starting.
$65.00
at
Moonlight Garden Supply
More Therm-O-Rock Vermiculite options
Who it's for
- Busy gardeners needing to extend time between watering sessions
- Seed starters looking for sterile, supportive germination environments
- Indoor growers struggling with heavy, compacted potting soil
Who should skip it
- Long-term gardeners concerned about soil structure longevity
- Budget-conscious growers managing large-scale landscaping projects
- Succulent enthusiasts requiring extremely fast-draining soil mixes
Performance breakdown
Moisture Retention
Superior water-holding capacity keeps delicate seedlings hydrated for longer periods.
Aeration Efficiency
Lightweight structure prevents soil compaction, allowing roots to breathe easily.
Nutrient Buffering
Excellent cation exchange capacity helps hold essential nutrients near root zones.
Germination Suitability
Fine #3A grade creates the ideal environment for fragile seed starts.
Organic Compliance
OMRI listing ensures total peace of mind for certified organic growers.
Handling Ease
Lightweight material is simple to mix, though the large bag requires space.
Key Specs
Volume
4 cubic feet
Texture
Medium (#3A)
Primary Ingredient
Vermiculite
Certification
OMRI Listed
Know before you buy
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Ask Metto anything about the Therm-O-Rock Vermiculite Horticultural Media before you decide.
