Weeds Taking Over the Lawn
A weedy lawn is a thin lawn: weeds colonize bare and weak turf, so the lasting fix pairs a weed-and-feed that clears the current crop with the mowing and overseeding habits that close the canopy. Grass type decides everything, and the wrong bag damages southern lawns.
The short answer
Clear and thicken in one pass: Scotts Turf Builder Weed & Feed5 on a damp morning kills the broadleaf weeds while feeding the grass to fill their places. It holds 4.1 stars from 6,665 ratings at Home Depot, with 80 percent recommending it (November 2026). The main warning: check your grass type first, because this formula damages St. Augustine and can scorch Bermuda. The label's grass list is a requirement, not fine print.
Why does this happen?
Lawn weeds take any opening they are given. Turf thinned by short mowing, compaction, shade, drought, or skipped feeding leaves light and soil exposed, and weed seeds, which wait in soil by the thousands per square foot, germinate in the gaps. Killing the standing weeds without thickening the turf produces the familiar repeat every few months, because the gaps invite the next batch (crabgrass in spring gaps, dandelions in thin autumn turf) on the same terms. Thick, competitive turf is the weed control that never washes off.
Weed and feed products combine the clear and the feed in one operation, with a mechanical subtlety owners miss: the herbicide granules must stick to wet weed leaves to work, so application goes onto a dewy or lightly sprinkled lawn, followed by a dry day or two, and the fertilizer component then pushes grass growth into the dying weeds' footprint. Timing against the weed's life cycle matters as much. Post-emergents kill growing broadleaf weeds in spring and autumn. Crabgrass, a grassy annual, is a pre-emergent problem — a different product class, applied before the soil warms — and no bag of weed and feed can undo germination that has already happened.
The fix, in order
Work down the list: free and cheap steps first. Stop when the plant turns the corner; the product is only for what the free steps cannot do.
Free step
Identify the weeds and the grass, honestly
Broadleaf (dandelion, clover, plantain): this page's product class. Grassy (crabgrass, goosegrass): a pre-emergent calendar problem, handled next spring. Sedges and wild violets laugh at standard formulas. Ten minutes of identification decides which war you are in.
Habit step
Mow high and sharpen
Raise the mower to three to four inches for cool-season turf and sharpen the blade: taller grass shades soil (suppressing germination) and a clean cut keeps grass competitive. This step starts today and never ends. It is permanent weed control.
The product step
Apply Weed & Feed5 to a damp lawn, then leave it dry
Scotts Turf Builder Weed & Feed5 through a spreader at the label rate, onto morning dew or a light sprinkling, with no rain or irrigation for 24 to 48 hours per label so granules stay on the leaves. Weeds yellow and curl across one to two weeks; the grass greens as it feeds.
The product for this step
Scotts Turf Builder Weed & Feed5
Habit step
Overseed the thin places in their season
When the herbicide's label interval allows, overseed thin and bare areas (autumn for cool-season lawns): new grass is the only permanent occupant of the vacancies the weeds vacated. A thick lawn next year needs half this year's chemistry.
The evidence, in tiers
Tier 1 · The method
The post-emergent contact requirement (granules adhering to wet leaves) is the manufacturer's documented method, and the canopy-competition model is the extension turf program's central teaching.
Tier 2 · This product
Scotts Turf Builder Weed & Feed5 holds 4.1 stars from 6,665 ratings at Home Depot, with 80 percent of owners recommending it (November 2026).
We have not treated a test lawn for this guide. The application method is the label's, and the grass-type gate is stated as a condition of the pick.
Tier 3 · What owners report
Owner successes describe the weeds collapsing over two weeks followed by visible thickening. The failures cluster on dry-lawn application (the granules never stuck), expecting it to prevent crabgrass (it does not, and is not meant to), and southern grass damage from skipping the grass-type check. All three are covered in the steps above.
The alternatives, conceded where they win
| Option | What it is | The honest verdict |
|---|---|---|
| Weed & Feed5 plus canopy habits | Post-emergent kill and feeding in one pass, then thickening | The pick for broadleaf-invaded cool-season lawns: it fights this season's weeds and next season's vacancy simultaneously. |
| Liquid spray herbicides (hose-end or spot) | Targeted foliar kill without fertilizer | Wins on precision (only the weeds get chemistry), on difficult weed species with the right selective product, and on lawns that do not need feeding; it loses on coverage labor for a fully invaded lawn, where walking a spreader beats spraying ten thousand dandelions. |
| Hand pulling and boiling water | Mechanical and thermal spot control | Wins for a dozen weeds and for households avoiding chemistry near gardens and wells; it loses at invasion scale, where the labor curve bends vertical and the vacancy problem remains unaddressed. |
The honest price comparison
The honest comparison is the lawn-service contract at $300 to $600 a season for fertilization and weed control, against a $25 to $35 bag and a spreader you may already own, repeated two or three times a year. The service sells the same chemistry with better timing. This page gives you the timing.
Where it falls short
These weaknesses come from the product's own reviews, not from a rival's marketing. Read them before you buy.
- Grass-type damage is a real and common failure (St. Augustine above all); the gate in the triage is the price of the recommendation.
- It does not touch crabgrass already up, sedges, or violet empires; weed identification is a condition of its rating here.
- It is still an herbicide: label setbacks from gardens, water, and play areas, and the rain window, are part of the method and the law of the label.
The product, in short
Scotts Turf Builder Weed & Feed5
Questions people ask next
Why did it not kill my crabgrass?
Crabgrass is a grass, and this product's herbicides target broadleaf weeds; killing crabgrass in a lawn of grass requires either pre-emergent timing (spring, before germination) or grass-selective chemistry with its own label. The weed ID step exists because the bag cannot read your lawn.
When is the best time to apply?
When broadleaf weeds are actively growing and leaves will stay damp then dry: spring and early autumn are the prime windows for cool-season lawns, with autumn the connoisseur's choice (weeds are moving reserves to roots, carrying the herbicide with them, and overseeding follows in the same season).
Can I use it where my kids and dog play?
Follow the label's re-entry rule (typically after granules are watered in at the next cycle and the lawn is dry), and store and apply with the label's care. As everywhere on this site, the label outranks the article.
My lawn is more weeds than grass. Still this?
Past a certain ratio the honest project is renovation: kill, reseed, and establish, or sod, in the right season. Weed and feed farms a lawn that exists; it cannot conjure one. A lawn that is 70 percent weeds is a garden bed awaiting a decision.
Extension turf guidance on weed competition and post-emergent timing; product label for grass-type restrictions · Home Depot product record for Scotts Turf Builder Weed & Feed5 (November 2026)
The Fix JournalCase 05Plants & Garden