Espoma Organic Rock Phosphate
Best organic amendment for gardeners seeking stronger roots and vibrant blooms.
This is the secret weapon for anyone serious about root health and long-term soil vitality. It requires patience since it works slowly, but it provides the essential, steady phosphorus boost that synthetic alternatives simply cannot replicate for bulbs and perennials.
$12.89
at
Martin's (official store / Martin's AG & Feed)
More Rock Phosphate options
Who it's for
- Organic gardeners seeking chemical-free soil nourishment
- Patient gardeners prioritizing long-term soil health
- Flower and fruit growers aiming for robust plant development
Who should skip it
- Gardeners needing immediate nutrient results for struggling plants
- Gardeners working with highly alkaline soil conditions
- Users preferring highly concentrated, fast-acting synthetic fertilizers
Performance breakdown
Root development support
High phosphorus content drives exceptional root establishment for new plantings.
Organic integrity
Certified organic formula ensures safe, natural soil enrichment for home gardens.
Nutrient release efficiency
Slow-release granular structure provides steady, long-term feeding for perennials.
Application versatility
Perfectly suited for fall bulb planting and general flowering shrub maintenance.
Ease of handling
The 7.25 lb bag size is manageable for most residential gardeners.
Flowering performance
Directly promotes vibrant blooms by correcting phosphorus deficiencies in soil.
Key Specs
Weight
7.25 lbs and 28 lbs
Form
Granular
Type
Phosphorus Supplement
Source
Organic/Natural
Certification
OMRI Listed
Primary Benefit
Root and Bloom Development
Pet/Child Safe
Yes
Primary Nutrient
Phosphorus
Know before you buy
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Ask Metto anything about the Espoma Organic Rock Phosphate before you decide.
