Ultra Tech Medium Vermiculite
Best soil amendment for gardeners focused on seed starting and propagation.
Enhance your plant's growth with Ultra Tech Medium Vermiculite, a 4.0 cubic foot bag of natural wicking mineral. This horticultural vermiculite excels at improving soil aeration and moisture retention, creating an ideal environment for roots to access nutrients, air, and water on demand. It's completely sterile, odorless, and non-toxic, making it safe for all your gardening projects. Perfect for seed starting, propagation, and even passive hydroponics, this vermiculite supports stronger, healthier plants and can lead to increased yields.
$19.99
Owner Satisfaction
4.6
/ 5
Category Rank
516
/ 1247
#516 in Soil
Price vs Category Average
-61%
Below average
Volume
4.0
/ cubic feet
Who it's for
- Seed starters looking for high germination success rates
- Busy gardeners needing to reduce their watering frequency
- Indoor growers focused on healthy root development
Who should skip it
- Budget-conscious gardeners managing large-scale planting projects
- Gardeners seeking an all-in-one nutrient-rich soil solution
- Long-term planters requiring permanent soil structure
Performance breakdown
Moisture Retention
High-capacity mineral structure keeps roots hydrated during dry spells.
Soil Aeration
Coarse texture prevents compaction to ensure vital oxygen reaches root systems.
Nutrient Availability
Efficiently holds and releases essential minerals for consistent plant uptake.
Sterility Standards
Completely sterile composition eliminates risk of soil-borne pathogens or pests.
Propagation Efficacy
Provides the perfect stable environment for delicate cuttings and seedlings.
Hydroponic Versatility
Reliable performance in passive systems for soil-free growing applications.
Key Specs
Volume
4.0 cubic feet
Material
Horticultural vermiculite
Grade
V3
Nutrient Retention
Holds ammonium, potassium, calcium, and magnesium
Texture
Coarse
Intended Use
Seed Starting
Soil Type
Potting Mix
Drainage Level
Retains Moisture
Features
- Attracts and holds essential plant nutrients.
- Improves soil aeration and moisture retention.
- Allows plants to access resources as needed.
- Promotes stronger plant growth and higher yields.
- Completely sterile, odorless, and non-toxic.
- Ideal for seed starting and propagation.
- Suitable for passive hydroponics systems.
What customers say
Customers consistently praise Ultra Tech Medium Vermiculite for its exceptional quality, specifically noting the uniform particle size which is crucial for successful seed starting and soil aeration. Users find this medium grade highly reliable, offering superior moisture retention without becoming overly compacted. The product arrives clean and dust free, making it easy to incorporate into various gardening mixes immediately. This consistency ensures predictable results, establishing it as a trusted staple for serious gardeners seeking dependable performance.
Know before you buy
Medium-grade vermiculite acts as a soil amendment that improves aeration while simultaneously increasing moisture retention. It creates a porous structure that allows roots to access water and nutrients more efficiently.
Yes, it is an excellent choice for seed starting. Because it is sterile and holds moisture well, it provides a clean, consistent environment for delicate seedlings to develop strong root systems.
Absolutely. This vermiculite is suitable for passive hydroponic systems where it helps maintain consistent moisture levels and supports plant stability.
No, this is a natural mineral product. While it does not contain added fertilizers, its chemical structure allows it to attract and hold onto essential nutrients like potassium, calcium, and magnesium so they remain available to your plants.
Each bag contains 4.0 cubic feet of horticultural-grade vermiculite, which is sufficient for large-scale gardening projects or mixing into multiple batches of potting soil.
Yes, the vermiculite is processed to be completely sterile, odorless, and non-toxic. This ensures you are not introducing unwanted pathogens or pests into your growing medium.
Still have a question?
Ask Hayley anything about this product before you decide.