Skip to main content
What Grass Is This? LogoWhat Grass Is This?
Sign In
HomeToolsIronite 1-0-1
1-0-1 · your ZIP

Ironite calculator

Ironite 1-0-1 is an iron supplement, not a fertilizer, so it greens the lawn without forcing a flush of growth. The rate is about 3 lbs per 1,000 sq ft alongside your regular feeding. Enter your lawn size and ZIP for the amount, bags, and timing.

Label rates at a glance

Every product below has its own label rate and application limit. The calculator uses the label rate as the source of truth and reports the nitrogen it delivers, so you can compare products fairly.

ProductN-P-KRate / 1,000 sq ftBag / bottleMax apps / yr
Milorganite 6-4-06-4-012.8 lbs32 lb / 2,500 sq ft4
Scotts Turf Builder Lawn Food32-0-42.5 lbs12.5 lb / 5,000 sq ft4
Scotts Turf Builder Weed & Feed28-0-32.9 lbs14.3 lb / 5,000 sq ft2
Scotts Turf Builder Triple Action25-0-22.8 lbs11.3 lb / 4,000 sq ft2
Scotts Turf Builder Southern Lawn Food32-0-102.8 lbs14 lb / 5,000 sq ft4
The Andersons PGF Complete 16-4-816-4-83.6 lbs18 lb / 5,000 sq ft6
Lesco 24-0-1124-0-114 lbs50 lb / 12,500 sq ft4
Simple Lawn Solutions Advanced 16-4-816-4-810 fl oz / 1,000 sq ft32 oz / 3,200 sq ft6
Ironite 1-0-11-0-13 lbs15 lb / 5,000 sq ft4
Scotts Turf Builder Starter Food for New Grass24-25-43 lbs15 lb / 5,000 sq ft1 (at seeding)

Why your schedule depends on your ZIP

A Milorganite schedule in Cleveland is not a Milorganite schedule in Atlanta. Cool-season lawns feed hardest in spring and fall and skip summer nitrogen in hot regions. Warm-season lawns feed through summer and stop before their fall dormancy. The calculator shifts each product's application windows using your region's frost dates and growing season.

Cool-season lawns

Feed hardest in spring and fall. In hot regions the calculator drops summer nitrogen entirely, because feeding heat-stressed fescue or bluegrass does more harm than good.

Warm-season lawns

Feed from full green-up through late summer. The last application lands about 6 weeks before dormancy, so late-fall feedings are dropped automatically.

Your region

Northern ZIPs shift every window later; southern ZIPs shift earlier and open a longer season. The same product gets a genuinely different calendar.

Have a different bag? The fertilizer rate calculator works with any N-P-K, and the full fertilizer calculator builds a season plan from your grass type.

Rate calculatorFull fertilizer plan

Ironite questions, answered

How much Ironite do I need?

The label rate is about 3 lbs per 1,000 sq ft, so a 15 lb bag covers roughly 5,000 sq ft. The calculator scales it to your lawn size.

Does Ironite replace fertilizer?

No. Ironite is an iron supplement with almost no nitrogen (1-0-1). It deepens color between feedings but does not feed the lawn, so use it alongside a real fertilizer, not instead of one.