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Solutions by turf type, condition and season

Start from what you manage. Each path leads to the program calendars, problem guides and product data that apply to it.

By turf type By turf condition Season by season

By turf type

Cool-season, warm-season and transition zone

Growth potential shows when turf can actually use nutrition and recover from stress. The Foundation Program places biology, organic nutrition and carbon inside those windows.

By turf type

Cool-season turf

Creeping bentgrass, Kentucky bluegrass, perennial ryegrass, tall and fine fescues, Poa annua

Cool-seasonWarm-seasonIndianapolis, IN climate

Two growth peaks, spring and fall. Summer heat slows shoot growth and shortens roots.

Start biology with the first foliar application of the year; granular early for green-up and colonization.
Carry roots into summer with light, steady feeding and liquids every 21 days.
Fall is the main window for fertility, aerification recovery and carbohydrate storage.

Sports turf calendarMidwest cool-season pilot Lawn & T&O calendarMidwest cool-season pilot

By turf type

Warm-season turf

Bermudagrass (incl. ultradwarf greens), zoysiagrass, St. Augustinegrass, seashore paspalum, centipedegrass

Cool-seasonWarm-seasonAtlanta, GA climate

One long summer peak. Growth stops at dormancy; overseeded sites switch to a cool-season program for winter.

Support green-up as soils warm, then start the liquid cycle with the first foliar application.
Summer is the cultivation and recovery window: 2X granular at aerification, with topdressing.
In fall, improve structure and drainage, build reserves and limit excess nitrogen before dormancy.

Golf course calendarSoutheast bermudagrass pilot

By turf type

Transition zone

Tall fescue, Kentucky bluegrass, zoysiagrass, bermudagrass, bentgrass greens

Cool-seasonWarm-seasonNashville, TN climate

Neither type is fully at home. Cool-season turf is stressed in summer; warm-season turf risks winter injury.

Choose the calendar by species, not by map: a bentgrass green and a bermudagrass fairway on one site follow different programs.
Root-zone health and recovery windows matter most at both ends of the year.
Transition-zone calendars are in development; we build them site by site on request.

Request a transition-zone programBuilt from your site profile

Growth potential (0 to 1) from the turfgrass growth potential model (Gelernter and Stowell, 2005; optimum air temperature 68 °F for cool-season and 88 °F for warm-season turf), calculated from approximate 1991–2020 monthly mean temperatures for each city. Illustrative only; your site's microclimate, shade and irrigation change the curve. Dashed line marks today.

By turf condition

Common conditions and where the program fits

Agronomy first: each guide starts with the cultural practice, then shows where Sigma products support it.

Guide readyAerification recovery

Timing, topdressing and feeding before, on and after the day of aerification.

Where Sigma fitsSigma Bio granular at 2X with topdressing; Sigma 4-4-4 Bio when recovery is the priority.

Read the guide →Guide readyBlack layer and anaerobic root zones

Cause, symptoms and corrections for low-oxygen bands in sand root zones.

Where Sigma fitsBiology complements venting, aerification and reducing sulfur sources. It does not replace them.

Read the guide →ScienceThatch and organic matter

How cellulose-degrading organisms slow thatch and mat accumulation.

Where Sigma fitsTrichoderma and Bacillus in every Sigma Bio granular and liquid.

Mode of action →Seasonal guideWet, low-light winters

Saturation, low oxygen and carbohydrate depletion on Southeast bermudagrass.

Where Sigma fitsLow-growth, high-benefit nutrition and consistent biological inputs.

Southeast outlook →Program calendarTraffic and wear recovery

Recovery windows planned around the competition schedule.

Where Sigma fitsGranular and liquid timing keyed to events, cultivation and overseeding.

Sports turf calendar →Program calendarSpring green-up

Getting biology and nutrition in place as soils warm.

Where Sigma fitsGranular early for green-up and colonization; liquids start with the first foliar application.

Golf calendar →ProgramEstablishment and grow-in

Sprigging, sodding, seeding, overseeding and new sand root zones.

Where Sigma fitsGranular high rate before planting, then weekly liquids with every grow-in spray.

Establishment programs →Product dataPhosphorus-restricted sites

Programs where local rules or soil tests limit phosphorus.

Where Sigma fitsSigma 6-2-6 Bio: high nitrogen and potassium, low phosphorus.

Product library →Guides in developmentNext problem guides

Summer decline
Low light and shade
Sand root-zone establishment
Poa annua seedhead management
Salinity and poor water quality

Tell us which you need next →

Season by season

What the program does through the year

The same four seasons look different on cool-season and warm-season turf. The current season is marked.

SpringMar – MayIn season now

Cool-season: Start biology with the first foliar application; granular early for green-up and colonization.
Warm-season: Support green-up as soils warm; begin the liquid cycle with the first foliar application.

SummerJun – AugIn season now

Cool-season: Protect roots through heat: light, steady feeding and liquids every 21 days.
Warm-season: Peak growth: cultivation, topdressing and recovery, with 2X granular at aerification.

FallSep – NovIn season now

Cool-season: Main window for fertility and aerification; build roots and carbohydrate reserves.
Warm-season: Improve structure and drainage, build reserves and limit excess nitrogen.

WinterDec – FebIn season now

Cool-season: Slow or dormant growth: plan the season from soil tests and records.
Warm-season: Low-growth, high-benefit nutrition; manage traffic; keep biological inputs consistent.

Need a calendar for your site?

Send your species, root zone and region. We build it around your existing fertility and IPM plan.

Request a program