GROW!T Perlite Grade #3, Coarse
Best coarse soil amendment for gardeners seeking superior drainage and aeration.
Enhance your plant's growth with GROW!T Perlite Grade #3, a super coarse volcanic mineral. This sterile medium is heated to expand, creating a snow-white, porous structure that significantly improves soil aeration and drainage. Its large surface area effectively retains moisture and essential nutrients, making them readily available for plant roots. Free from diseases, seeds, and insects, this perlite provides a clean and healthy foundation for robust plant development. Ideal for potting, it comes in a generous 100 Liter (3.53 cu ft) bag, offering ample material for your gardening needs.
$35.99
Owner Satisfaction
4.6
/ 5
Category Rank
516
/ 1247
#516 in Soil
Price vs Category Average
-29%
Below average
Weight
22.4
/ lbs
Who it's for
- Gardeners struggling with root rot and dense soil compaction
- Long-term growers wanting durable, reusable soil amendments
- Container gardeners managing large pots or hydroponic systems
Who should skip it
- Safety-conscious users avoiding respiratory irritants during mixing
- Aesthetic-focused gardeners bothered by floating surface debris
- Seed starters working with delicate, small-scale propagation trays
Performance breakdown
Aeration Efficiency
Super coarse grade ensures maximum oxygen flow to delicate root systems.
Drainage Capacity
Porous volcanic structure prevents waterlogging and protects against root rot.
Sterility Standards
High-heat processing eliminates pathogens and pests for a clean start.
Moisture Retention
Large surface area holds essential hydration exactly where plants need it.
Bulk Value
Generous 100-liter volume provides excellent coverage for large-scale potting projects.
Structural Integrity
Durable mineral composition resists compaction over long growing cycles.
Key Specs
Weight
22.4 lbs
Volume
100 L (3.53 cu ft)
Average Size Range
0.132" to 0.187"
Sterilization Temperature
1600-1700 degrees F
Fertilizer Source
Mineral Based
Pest Control Properties
Disease Control
Container Weight
22.4 pounds
Target Plant Type
Houseplants
Features
- Improves soil aeration and drainage
- Sterile and free from contaminants
- Retains moisture and nutrients
- Expands significantly when heated
- Porous volcanic mineral structure
- Ideal for potting applications
- Super coarse grade for optimal airflow
What customers say
Customers consistently praise the superior quality and size consistency of this coarse perlite. Gardeners appreciate that the Grade #3 size delivers exceptional drainage and aeration, which is crucial for preventing root rot and promoting vigorous plant growth, especially in container gardening and hydroponics. While perlite inherently involves some dust, users find this specific coarse grade minimizes fine particles, making preparation easier. The large quantity offered is frequently cited as providing excellent value for serious growers who need reliable, high performance soil amendments.
Know before you buy
Grade #3 is specifically designed for maximum aeration and drainage. The larger particle size creates bigger air pockets in your soil mix, which is ideal for preventing root rot and ensuring oxygen reaches the root zone of your houseplants.
No, this is a sterile, mineral-based product. It is heated to extreme temperatures during processing to ensure it is completely free of diseases, seeds, and insects, providing a clean slate for your potting mix.
A common ratio is one part perlite to three parts potting soil, but you can adjust this based on your plant's needs. Use more perlite for plants that prefer fast-draining soil, like succulents or cacti, to ensure the roots don't sit in excess moisture.
Yes, it is an excellent choice for houseplants. Because it is sterile and lightweight, it improves the structure of indoor potting mixes without introducing pests or pathogens into your home environment.
Perlite is a volcanic mineral and does not decompose or break down like organic matter such as peat moss or bark. It will maintain its porous structure for the life of your potting mix, ensuring consistent drainage.
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$36