A real garden setting. This photograph illustrates lawn care, not a particular state or grass species. Photo credits.
Make the plan fit your lawn.
Weather, soil and product formulations vary. Use local conditions and current product labels when deciding what to apply and when.
St. Augustine is a warm-season grass. Start with its growing cycle, then adapt the work to your Hawaii yard.
Know the grass you are caring for
St. Augustinegrass is a warm-season grass established mainly with sod or plugs. Cultivars differ in shade tolerance, mowing needs and disease susceptibility.
Start with your Hawaii site
Use growth, rainfall, irrigation and elevation to plan care. Do not assume a January dormant period or a mainland frost calendar. This guide is for an existing st. augustine lawn; its inclusion does not establish that the grass is recommended everywhere in the state.
Plan by growth, not a fixed date
Growth resumes. Wait for sustained warm-season growth before scheduling nitrogen or disruptive soil work. Initial green-up can be followed by cold weather.
Heat and the main growing period. Active warm-season growth can support repair and recovery from necessary core aeration. Match work to soil moisture and avoid drought-stressed turf.
Growth slows. In Hawaii, reassess care as rainfall and growth change rather than assigning every lawn a winter shutdown. Use CTAHR guidance for your site.
Mowing and repair
UF/IFAS recommends 3.5–4 inches for standard cultivars; dwarf types need a different setting. Identify the cultivar before copying a mowing height. Use suitable sod or plugs to repair gaps, with care matched to rooting and local conditions. Do not assume a generic bag of lawn seed contains St. Augustinegrass. See the bare-patch repair guide before preparing a seedbed.
Water and nutrients
Compare moisture beneath a struggling patch with nearby healthy turf and check sprinkler coverage before increasing every zone. There is no reliable national minutes-per-week setting. Use a catch-cup audit to measure what your system applies. For nutrients and pH, request soil-test recommendations for this grass and your measured lawn area; a fertilizer brand does not establish the correct dose.
When a patch looks wrong
A shaded or yellow patch does not automatically need fertilizer or fungicide. Look at light, roots, irrigation and leaf symptoms first. Photograph the whole pattern and close leaf details before selecting a treatment. Brown patches have several possible causes. Confirm the weed, insect or disease and the grass before using a pesticide; follow the current label’s allowed uses, rate, timing and access instructions.
Three useful things to do next
Identify the species or mixture and save its label. Measure the area of actual turf. Start a simple log of mowing, rain, irrigation and unusual patches so the next decision has evidence behind it.
Sources and local guidance
University guidance supports the species facts and care principles here. Rates and dates in a regional source apply to that region; they are not national prescriptions. Use your local extension office for cultivar, soil-test and treatment decisions.
COAST TO COAST GRASSJANUARY - DECEMBER / REUSABLE EACH YEAR
St. Augustine in Hawaii
Use growth, rainfall, irrigation and elevation to plan care. Do not assume a January dormant period or a mainland frost calendar.
Before you start: Hawaii: use rainfall, elevation and actual growth. This is a monthly check-in, not a dormant-season calendar.
01
January
Reset the care log
Record rainfall, irrigation and actual growth. Note elevation, wind exposure and wet areas.
Check: Hawaii has no single statewide winter shutdown.
02
February
Check the root zone
Repairs usually use sod or plugs, not generic lawn seed.
Check: Rainfall and irrigation together determine water supplied.
03
March
Check cutting quality
Inspect leaf tips and service the mower if the cut is ragged. Use the cultivar’s height.
Check: Mow by growth rather than a mainland spring date.
04
April
Audit the water
Use matching catch cups where irrigation operates. Fix uneven coverage before changing runtime.
Check: Rainfall varies greatly between nearby sites.
05
May
Repair when ready
Repair only in suitable growing conditions, using sod or plugs that match the cultivar; protect new rooting.
Check: Check your local establishment and water conditions.
06
June
Review nutrients
Compare soil recommendations with your application log and actual lawn area.
Check: Light-green color alone does not justify more fertilizer.
07
July
Watch dry exposures
Inspect sunny edges and windy areas. Check root-zone moisture before increasing irrigation.
Check: Standard and dwarf cultivars have different cutting heights.
08
August
Track wear
Photograph routes used by people and pets. Protect weak patches while you address their cause.
Check: Do disruptive work only if active recovery is likely.
09
September
Recheck shade
Observe where buildings and trees limit light. Compare shaded and open areas separately.
Check: More fertilizer cannot replace adequate light.
10
October
Follow changing rain
Review irrigation as rainfall changes. Note runoff or standing water after storms.
Check: Do not keep an earlier timer setting automatically.
11
November
Inspect leaf symptoms
Photograph expanding patches and individual leaves before selecting a treatment.
Check: Confirm the cause with local advice; color is not a diagnosis.
12
December
Compare the year
Compare growth and rainfall records, and choose the next useful site improvement.
Check: Continue care according to growth; use local CTAHR guidance.
Identify the cultivar
Repairs usually use sod or plugs, not generic lawn seed.
Standard and dwarf cultivars have different cutting heights.
Use current local advice and product labels for treatments. New seed, sod and plugs need establishment care. This is a planning guide, not a monthly application schedule.
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Start with the measurements that make later purchases more accurate.
Borrow tools where practical. Identify the grass before buying treatments or repair material.
TOOL-TYPE SEARCH
Outdoor measuring tape
Measure actual turf, leaving out patios and beds, before buying seed or calculating applications.
