Espoma Organic Greenrock
Best organic mineral supplement for gardeners managing heavy clay soil.
This pure basalt supplement is the ultimate secret weapon for correcting iron deficiencies and boosting foliage color. It’s a cleaner, more sustainable alternative to traditional greensand, though you’ll need patience—it works slowly to enrich the soil rather than offering an instant, synthetic growth spike.
$13.99
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Who it's for
- Gardeners wanting steady nutrient delivery without the risk of over-fertilization.
- Homeowners dealing with compacted earth or poor garden drainage.
- Organic growers seeking natural ways to replenish depleted soil minerals.
Who should skip it
- Growers needing a fast-acting solution for plants showing signs of distress.
- Novice gardeners looking for a single, all-in-one fertilizer product.
- Users with physical limitations who prefer lightweight soil amendments.
Performance breakdown
Foliage Vitality Support
High mineral density effectively combats yellowing and promotes deep green leaves.
Safety Profile
Natural basalt composition ensures total peace of mind for pet owners.
Application Versatility
Granular form integrates seamlessly into soil for flowers, shrubs, and vegetables.
Nutrient Bioavailability
Provides essential iron and magnesium in a stable, slow-release mineral format.
Organic Integrity
Pure basalt sourcing meets the highest standards for organic gardening practices.
Ease of Handling
Seven-pound bag size is manageable for most home gardeners to apply.
Key Specs
Package Weight
7 lbs
Material
100% pure basalt
Form
Granular
Organic Certified
Yes
Pet and Child Safe
Yes
Primary Nutrients
Iron, Calcium, Magnesium
Plant Type Application
Flowers, Vegetables
Water Soluble
No
Know before you buy
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