Jonathan Green Mag-I-Cal Plus for Acidic & Hard Soils
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Quick Stats
- 0-0-0
- Soil-amendment
- 5,000 sq ft
- 5 lbs per 1,000 sq ft (mild) to 10 lbs per 1,000 sq ft (severe)
- No
- No
Verify these figures against the current package before buying or applying.
Pros & Cons
Pros
- Dual action: raises pH and loosens compacted clay soil simultaneously
- Fast-acting pelletized formula — results in 6–8 weeks vs. 12+ months for ag lime
- 5,000 sq ft coverage — enough for most suburban yards in one bag
- The enthusiast community's top lime pick before fall overseeding
Cons
- More expensive per sq ft than traditional ground limestone
- 18 lb bag may require multiple purchases for large properties
- Does not lower pH — only for acidic soil correction
Catalog pros and cons are not presented as verified product facts. Check the current package and dated source notes before relying on a specific claim.
Fit to verify
Acidic lawns (pH below 6.5) with hard or compacted clay soil needing pH correction before seeding — confirm against your own zone, sun, and soil conditions.
Decision Notes
What this page can establish
The catalog identifies Jonathan Green Mag-I-Cal Plus for Acidic & Hard Soils and links to source notes where available. It does not establish a current seed tag, lot, seller, price, availability, NTEP result, or product performance in your yard.
Verify before choosing
- - Match the current package contents and application rate to the exact SKU.
- - Check cultivar names against relevant trials only when the identity matches.
- - Confirm local species fit with extension guidance and your site conditions.
- - Confirm seller, bag size, price, and availability at checkout.
Other options to compare
These are comparison links, not ranked substitutes or fit recommendations.
Our Notes
Mag-I-Cal Plus is the lime product we recommend most because it does two things at once: raises pH in acidic soil AND addresses compaction with added soil conditioners. Traditional ag lime is cheap but slow — it can take a year or more to meaningfully shift pH. Mag-I-Cal Plus is pelletized and reacts much faster, with noticeable pH improvement in 6–8 weeks. The 'Plus' formula adds a gypsum-like soil loosening component, making it especially useful for lawns with heavy clay that have become hard and compacted. For the homeowner whose soil test came back with pH below 6.0 and who wants to seed in the fall, this is the pick: apply it 4–6 weeks before seeding, water it in, and by seed day your soil will be better structured AND closer to the 6.0–7.0 target. The 18-lb bag covers 5,000 sq ft — a full treatment for the average suburban yard. Rate: 5 lbs per 1,000 sq ft for mild deficiency (pH 6.0–6.5); up to 10 lbs for severe deficiency (pH below 5.5).
Editorial catalog notes — not lab-tested results; verify current label facts.
Where to Buy
Commerce links only. Verify the exact item, seller, package, price, and availability on the retailer page.
Community evidence limit
No synthesized testimonial is presented for this product. Community reports may identify questions or recurring patterns, but they do not establish product quality, value, current package identity, performance, or fit without an attributable source and matching evidence.
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