St. Augustine Grass Fertilization Guide for Georgia
Fertilization recommendations specifically for st. augustine grass lawns in Middle Georgia. Product safety, timing, and what to expect from professional treatment.
Grass-specific care
Why St. Augustine Grass Needs Different Fertilization
St. Augustine Grass has unique characteristics that affect how lawn fertilization should be applied. St. Augustine grass is susceptible to gray leaf spot and chinch bugs. Treatment plans must account for these vulnerabilities.
Getting the product, rate, and timing wrong doesn't just waste money — it can damage your lawn. We match every treatment to your specific grass type.
Quick profile
St. Augustine Grass at a Glance
Mowing Height
2.5-4 inches
Water Needs
High
Nitrogen Needs
Moderate feeder
Sun Requirement
Partial shade to full sun
Strengths
Best shade tolerance of any warm-season grass
Thick, lush appearance with broad blades
Good salt tolerance
Establishes quickly from sod
Vulnerabilities
Very susceptible to gray leaf spot disease
Chinch bugs are a major threat
High water requirements
Cannot tolerate heavy foot traffic
Less common in Middle Georgia — limited local supplier availability
Our approach
Fertilization for St. Augustine Grass in Georgia
St. Augustine needs moderate nitrogen (2-4 lbs per 1,000 sq ft annually) and responds well to iron supplementation for deep green color. We time applications to its growth cycle, starting after full green-up and tapering before dormancy. Over-feeding promotes gray leaf spot susceptibility, so we balance nutrition with disease resistance.
Treatment timing
When to Apply Fertilization to St. Augustine Grass
Spring
First nitrogen after St. Augustine reaches full green-up. Iron for immediate color boost.
Summer
Split nitrogen applications during active growth. Monitor for gray leaf spot response.
Fall
Reduce nitrogen. Potassium to harden turf before winter. Iron for color.
Winter
No nitrogen. St. Augustine is semi-dormant and excess feeding promotes disease.
Results timeline
What to Expect After Treatment
Iron supplementation produces visible color improvement within 1-2 weeks
Nitrogen-driven density increase visible within 3-4 weeks
Blade width and thickness improve with consistent feeding
Balanced fertilization reduces gray leaf spot susceptibility
Lawn enters winter with stored reserves for earlier spring green-up
Why Attaboy
Why Trust Attaboy for St. Augustine Grass Fertilization
Common questions
St. Augustine Grass Fertilization Questions
How much fertilizer does St. Augustine need compared to bermuda?
St. Augustine needs about half the nitrogen bermuda requires — 2-4 lbs per 1,000 sq ft per year versus bermuda’s 4-5 lbs. Over-fertilizing St. Augustine creates lush top growth that’s highly susceptible to gray leaf spot disease. We calibrate rates to maintain density without inviting fungal problems.
Should I fertilize St. Augustine grass in shade?
Shaded St. Augustine needs less fertilizer than sunny areas. It grows slower in shade, and excess nitrogen in low-light conditions produces weak, elongated growth that’s disease-prone. We reduce nitrogen rates by about one-third in shaded sections and supplement with iron for color.
Why does my St. Augustine look pale even after fertilizing?
Pale color despite fertilization usually points to an iron deficiency or soil pH issue. St. Augustine needs iron supplementation, especially in clay soil where iron can be locked up at higher pH levels. We check soil conditions and add iron to the fertility program when nitrogen alone isn’t producing the color response you expect.
How often do you fertilize?
We fertilize on most visits — 6-8 times per year. The blend and rate change with the seasons to match your grass type’s growth cycle.
Can you over-fertilize a lawn?
Yes, and it causes more harm than good. We use calibrated rates for your specific grass type. Centipede, for example, needs far less nitrogen than bermuda.
Related guides
More St. Augustine Grass Care Guides
Fertilization for Other Grass Types
Get started
Professional Fertilization for St. Augustine Grass Lawns
No contracts, no hidden fees. Products matched to st. augustine grass. First treatment within 24 hours.