Horticulture
Vermiculite for Horticulture
Moisture Retention
Nutrient Holding
Seed Starting
Why Growers Choose Vermiculite
Vermiculite is a naturally occurring mineral that expands when heated, creating a lightweight, highly absorbent material widely used in horticulture.
Unlike perlite, which improves drainage, vermiculite is used to retain moisture and stabilize nutrients, helping growers maintain more consistent growing conditions.
From greenhouse propagation to large-scale soil blending, vermiculite supports uniform moisture distribution, root development, and plant health.
Common Applications
Available Formats
- Bulk
- Super sacks
- Bagged (multiple sizes available)
Sizes and Gradations
Different applications require different particle sizes. Whittemore offers a full range of horticultural grades, including specialty options. Sizes shown are typical industry ranges. We can align to your exact specifications.
Micron (Ultra-Fine)
Typical size: <150 microns
For precision applications and moisture control in fine media , seed coatings, pelleting, plug mixes, and rooting slurries
Super Fine
Typical size: 150–500 microns
Ideal for seed starting, micro plugs, and small-cell propagation.
Fine
Typical size: ~0.5–1.5 mm
Balanced moisture retention for small containers and bedding plants.
Medium
Typical size: ~1.5–3.0 mm
Most versatile grade for potting mixes, greenhouse, and container production.
Coarse
Typical size: ~3–6 mm
Improves aeration and maintains moisture balance in soil conditioning and landscaping blends.
