Every lawn care job, step by step
A lawn doesn't need a hundred products. It needs about a dozen jobs done at the right time, in the right order, and most of them only once or twice a year. The failures we see most aren't the wrong job — they're the right job done at the wrong moment: pre-emergent after the crabgrass is up, seed spread onto a fresh herbicide barrier, aeration in July on a dormant lawn.
Each guide below is the procedure itself: the decision test for whether your lawn actually needs the job, the timing cues by grass type, the tools and rates, the steps, a video that shows the work being done, and the mistakes that undo it. Every guide cites university extension sources and states rates in imperial and metric.
The jobs by season
Dates are for the northern hemisphere. Cool-season lawns (bluegrass, ryegrass, fescues) do their heavy work in fall; warm-season lawns (Bermuda, zoysia, St. Augustine, centipede) in late spring and summer. Not sure which you have? Start with what kind of grass do I have?
| Job | Cool-season lawn | Warm-season lawn | How often |
|---|---|---|---|
| Take a soil sample | Fall or early spring | Fall or early spring | Every 2–3 years |
| Apply pre-emergent | Early spring, soil 55°F (13°C) | Early spring, plus fall for Poa annua | 1–2× a year |
| Fertilize | Fall-heavy; light late spring | Late spring through summer | 2–4× a year |
| Mow at the right height | Spring–fall, weekly in flush | Late spring–fall | Weekly in season |
| Water | Summer, as rainfall falls short | Summer, as rainfall falls short | Weekly check |
| Apply weed killer | Fall best; spring second | Late spring–summer, weeds growing | As needed |
| Apply grub preventer | Late spring–early summer | Late spring–early summer | Only with a grub history |
| Apply fungicide | Early summer, before symptoms | Spring/fall for large patch | Only for recurring disease |
| Core aerate | Early fall (or spring) | Late spring–early summer | Every 1–3 years |
| Dethatch (scarify) | Early fall (or spring) | Late spring, fully green | When thatch exceeds ½ in (13 mm) |
| Overseed | Early fall | Late spring (same species) | Every 1–3 years |
| Remove moss | Spring or early fall | Rare | Until the cause is fixed |
| Lime | Fall, on a soil test | Fall, on a soil test | Only when pH is low |
| Deal with fallen leaves | Weekly through leaf drop | Weekly through leaf drop | Every autumn |
| Winterize | Late fall, before the ground freezes | Stop nitrogen; irrigation blowout | Every autumn |
Preparation and soil
- How to take a lawn soil sample — the sampling procedure that makes every other rate on this page accurate. Then read your soil test results.
- How to lime a lawn — only on a soil test; product types, rates, timing and why it takes months.
- How to core-aerate a lawn — compaction tests, core vs spike, timing by grass type, and what to do with the holes.
- How to dethatch (scarify) a lawn — measure thatch first; power rake vs verticutter; recovery.
Feeding and seeding
- How to fertilize a lawn — bag math, spreader calibration, the two-pass method and watering in. The calendar lives in when to fertilize.
- How to overseed a lawn — the fall window, seed-to-soil contact and the aftercare calendar.
- How to fix bare patches — spot repair, from cause to first mow.
- How to winterize a lawn — the late-fall feeding that actually matters, last mow, irrigation blowout.
Weeds, pests and disease
- How to apply pre-emergent — soil-temperature timing, watering in, and the seeding conflict.
- How to apply post-emergent weed killer — identify first, then product, timing, sprayer setup and drift.
- How to apply grub preventer — preventive windows by active ingredient, watering in, and nematodes where chemicals aren't sold.
- How to apply lawn fungicide — when spraying is justified, preventive timing, rotation, and coverage.
- How to remove moss from a lawn — kill it, rake it, then fix the cause or it returns.
Routine care
- Mowing height guide — the one-third rule, heights by species, first and last mow.
- Lawn watering guide — the 1-inch (25 mm) weekly rule, run times, and the signs of too much and too little.
- Fallen leaves: mulch or remove? — how thick a layer you can mow in, and when to rake.
Get these jobs scheduled for your lawn
Lawn Care AI builds a year-round plan from your grass type, climate and soil test, then reminds you at the right soil temperature and weather window — pre-emergent before the crabgrass, aeration when the turf can recover, no watering nudge after rain.
The order matters
Three sequences cause most of the wasted weekends. Pre-emergent and seed don't mix: a spring barrier blocks grass seed for 8–16 weeks, so seed in fall or pick a seed-safe product. Aerate and dethatch before you feed and seed, not after — the holes and the exposed soil are the point. And lime and fertilizer go on separate days: applied together, lime drives off part of the nitrogen you just paid for. Each guide flags the conflicts that touch it.